Snippets for fluidsynth 2.6.0 from Alpine s390x

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-s390x/community/fluidsynth/fluidsynth-2.6.0-r0.log.

/home/buildozer/aports/community/fluidsynth/src/fluidsynth-2.6.0/test/test_synth_render_s16.c:299:12: warning: cast from function call of type 'clock_t' {aka 'long int'} to non-matching type 'double' [-Wbad-function-cast]
  299 |     return (double)clock() / (double)CLOCKS_PER_SEC;
      |            ^

/home/buildozer/aports/community/fluidsynth/src/fluidsynth-2.6.0/test/test_seq_event_queue_sort.c:22:9: warning: unused variable 'i' [-Wunused-variable]
   22 |     int i, seqid = fluid_sequencer_register_client(seq, "test order at same tick", callback_stable_sort, NULL);
      |         ^

/home/buildozer/aports/community/fluidsynth/src/fluidsynth-2.6.0/test/test_preset_pinning.c:181:5: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
  181 |     fluid_defsfont_t *defsfont = fluid_sfont_get_data(sfont);
      |     ^~~~~~~~~~~~~~~~

/home/buildozer/aports/community/fluidsynth/src/fluidsynth-2.6.0/test/test_mts_cc_tuning.c:48:5: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
   48 |     int key = 60;
      |     ^~~

/home/buildozer/aports/community/fluidsynth/src/fluidsynth-2.6.0/test/test_rvoice_dsp_interpolate.cpp:533:19: warning: enumeration value 'FLUID_INTERP_MID' not handled in switch [-Wswitch]
  533 |             switch(modes[m])
      |                   ^

/home/buildozer/aports/community/fluidsynth/src/fluidsynth-2.6.0/test/test_rvoice_dsp_interpolate.cpp:533:19: warning: enumeration value 'FLUID_INTERP_HIGH' not handled in switch [-Wswitch]

/home/buildozer/aports/community/fluidsynth/src/fluidsynth-2.6.0/test/test_rvoice_dsp_interpolate.cpp:486:22: warning: unused variable 'sample_ring_buffer' [-Wunused-variable]
  486 |         fluid_real_t sample_ring_buffer[FLUID_INTERP_HIGHEST + 1];
      |                      ^~~~~~~~~~~~~~~~~~