Snippets for aegisub 3.5.0~beta from Fedora s390x

Sourced from https://kojipkgs.fedoraproject.org/packages/aegisub/3.5.0~beta/1.fc45/data/logs/s390x/build.log.

../subprojects/luabins/src/saveload.h:28:7: warning: typedef ‘static_assertion_failed_at_line_76’ locally defined but not used [-Wunused-local-typedefs]
   28 |       static_assertion_failed_at_line_, \
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

../subprojects/luabins/src/saveload.h:28:7: warning: typedef ‘static_assertion_failed_at_line_78’ locally defined but not used [-Wunused-local-typedefs]
   28 |       static_assertion_failed_at_line_, \
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

../subprojects/luabins/src/saveload.h:28:7: warning: typedef ‘static_assertion_failed_at_line_80’ locally defined but not used [-Wunused-local-typedefs]
   28 |       static_assertion_failed_at_line_, \
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

../libaegisub/lua/modules/lpeg.c:2377:24: warning: cast between incompatible function types from ‘void (*)(lua_State *, const char * (*)(const char *, const char *, const char *, const void *), const void *, size_t)’ {aka ‘void (*)(lua_State *, const char * (*)(const char *, const char *, const char *, const void *), const void *, long unsigned int)’} to ‘int (*)(lua_State *)’ [-Wcast-function-type]
 2377 |   lua_pushcfunction(L, (lua_CFunction)&l_newpf);  /* new-pattern function */
      |                        ^

../libaegisub/lua/modules/lpeg.c:541:14: warning: this statement may fall through [-Wimplicit-fallthrough=]
  541 |         stack--;
      |         ~~~~~^~

../libaegisub/lua/modules/lpeg.c:616:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
  616 |         luaL_error(L, "reference to %s outside a grammar", val2str(L, -1));
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

../libaegisub/common/charset_conv.cpp:86:24: warning: unused variable ‘res’ [-Wunused-variable]
   86 |                 size_t res = cd(&src, &srcLen, &dst, &dstLen);
      |                        ^~~

../libaegisub/common/cajun/elements.cpp:32:47: warning: storing the address of local variable ‘null’ in ‘MEM[(struct CastVisitor *)visitor_5(D)].element’ [-Wdangling-pointer=]
   32 |         void Visit(T& ele) override { element = &ele; }
      |                                       ~~~~~~~~^~~~~~

../libaegisub/lua/script_reader.cpp:42:42: warning: comparison is always false due to limited range of data type [-Wtype-limits]
   42 |                 if (size >= 3 && buff[0] == -17 && buff[1] == -69 && buff[2] == -65) {
      |                                  ~~~~~~~~^~~~~~

../libaegisub/lua/script_reader.cpp:42:60: warning: comparison is always false due to limited range of data type [-Wtype-limits]
   42 |                 if (size >= 3 && buff[0] == -17 && buff[1] == -69 && buff[2] == -65) {
      |                                                    ~~~~~~~~^~~~~~

../libaegisub/lua/script_reader.cpp:42:78: warning: comparison is always false due to limited range of data type [-Wtype-limits]
   42 |                 if (size >= 3 && buff[0] == -17 && buff[1] == -69 && buff[2] == -65) {
      |                                                                      ~~~~~~~~^~~~~~

../tests/tests/charset.cpp:39:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wdangling-else]
   39 |         if (expected_encoding)
      |            ^

../src/MatroskaParser.c:578:11: warning: comparison of unsigned expression in ‘< 0’ is always false [-Wtype-limits]
  578 |     if (nb<0)
      |           ^

../src/MatroskaParser.c:2512:28: warning: variable ‘bad’ might be clobbered by ‘longjmp’ or ‘vfork’ [-Wclobbered]
 2512 |   int         id, have_tc, bad;
      |                            ^~~

../src/MatroskaParser.c:2352:30: warning: variable ‘ret’ might be clobbered by ‘longjmp’ or ‘vfork’ [-Wclobbered]
 2352 |   int                   cid, ret = 0;
      |                              ^~~

../src/MatroskaParser.c:1455:64: warning: ‘CompScope’ may be used uninitialized [-Wmaybe-uninitialized]
 1455 |   if (t.CompEnabled && t.CompMethod == COMP_ZLIB && (CompScope & 2) && cplen > 0) {
      |                                                     ~~~~~~~~~~~^~~~

../src/MatroskaParser.c:2017:15: warning: variable ‘nSeekHeads’ might be clobbered by ‘longjmp’ or ‘vfork’ [-Wclobbered]
 2017 |   unsigned    nSeekHeads = 0, dontstop = 0;
      |               ^~~~~~~~~~

../src/ass_parser.cpp:76:39: warning: typedef ‘using AssParser::HeaderToProperty::ProcessProperty(AssFile*, const std::string&, const std::string&)::<unnamed struct>::result_type = void’ locally defined but not used [-Wunused-local-typedefs]
   76 |                                 using result_type = void;
      |                                       ^~~~~~~~~~~

../src/command/command.h:115:30: warning: ‘virtual void cmd::Command::operator()(agi::Context*)’ was hidden [-Woverloaded-virtual=]
  115 |                 virtual void operator()(agi::Context *c)=0;
      |                              ^~~~~~~~

../src/validators.cpp:49:1: warning: base class ‘class wxValidator’ should be explicitly initialized in the copy constructor [-Wextra]
   49 | IntValidator::IntValidator(IntValidator const& rgt)
      | ^~~~~~~~~~~~

../src/validators.cpp:98:1: warning: base class ‘class wxValidator’ should be explicitly initialized in the copy constructor [-Wextra]
   98 | DoubleValidator::DoubleValidator(DoubleValidator const& rgt)
      | ^~~~~~~~~~~~~~~