Snippets for smpeg 0.4.4 from FreeBSD 150amd64

Sourced from https://pkg-status.freebsd.org/beefy23/data/latest-per-pkg/smpeg/0.4.4_18/150amd64-default.log.

• mpegtoraw.cpp:294:13: warning: add explicit braces to avoid dangling else [-Wdangling-else]
    294 |             else
        |             ^
  

• MPEGvideo.cpp:178:18: warning: conversion from string literal to 'char *' is deprecated [-Wc++11-compat-deprecated-writable-strings]
    178 |         SetError("Not a valid MPEG video stream");
        |                  ^
  

• MPEGvideo.cpp:459:26: warning: conversion from string literal to 'char *' is deprecated [-Wc++11-compat-deprecated-writable-strings]
    459 |                 SetError("Not an MPEG video stream");
        |                          ^
  

• video.cpp:1058:42: warning: conversion from string literal to 'char *' is deprecated [-Wc++11-compat-deprecated-writable-strings]
   1058 |             vid_stream->_smpeg->SetError("Invalid sequence in video stream");
        |                                          ^
  

• MPEG.cpp:111:16: warning: conversion from string literal to 'char *' is deprecated [-Wc++11-compat-deprecated-writable-strings]
    111 |       SetError("No audio/video stream found in MPEG");
        |                ^
  

• MPEGsystem.cpp:437:14: warning: conversion from string literal to 'char *' is deprecated [-Wc++11-compat-deprecated-writable-strings]
    437 |     SetError("Could not find the beginning of MPEG data\n");
        |              ^
  

• MPEGsystem.cpp:1245:16: warning: conversion from string literal to 'char *' is deprecated [-Wc++11-compat-deprecated-writable-strings]
   1245 |       SetError("Could not find the beginning of MPEG data\n");
        |                ^
  

• MPEGsystem.cpp:1326:24: warning: conversion from string literal to 'char *' is deprecated [-Wc++11-compat-deprecated-writable-strings]
   1326 |       system->SetError("Could not find the beginning of MPEG data\n");
        |                        ^
  

• plaympeg.c:265:21: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
    265 |     fprintf(stderr, answer + 4);
        |                     ^~~~~~~~~~