Work around intermittent Meson wrap-build failures

[kcgen]

Attempts to solve the following through brute-force repetition:

FAILED: subprojects/fluidsynth-2.2.6/src/fluid_conv_tables.inc.h subprojects/fluidsynth-2.2.6/src/fluid_rvoice_dsp_tables.inc.h 
"D:/a/_temp/msys64/mingw64/bin/meson" "--internal" "exe" "--unpickle" "D:/a/dosbox-staging/dosbox-staging/build/meson-private/meson_exe_make_tables_76da7216b7ad891a922e4f7241616b5b130aafe7.dat"
[8/472] Compiling C object subprojects/fluidsynth-2.2.6/test/test_preset_sample_loading.exe.p/test_preset_sample_loading.c.obj
[9/472] Compiling C object subprojects/fluidsynth-2.2.6/test/test_sample_rate_change.exe.p/test_sample_rate_change.c.obj
../subprojects/fluidsynth-2.2.6/test/test_sample_rate_change.c: In function 'main':
../subprojects/fluidsynth-2.2.6/test/test_sample_rate_change.c:55:5: warning: 'fluid_synth_set_sample_rate' is deprecated [-Wdeprecated-declarations]
   55 |     fluid_synth_set_sample_rate(synth, sample_rate);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from subprojects/fluidsynth-2.2.6/include/fluidsynth.h:100,
                 from ../subprojects/fluidsynth-2.2.6/test/test_sample_rate_change.c:3:
../subprojects/fluidsynth-2.2.6/include/fluidsynth/synth.h:253:38: note: declared here
  253 | FLUID_DEPRECATED FLUIDSYNTH_API void fluid_synth_set_sample_rate(fluid_synth_t *synth, float sample_rate);
      |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
ninja: build stopped: subcommand failed.

[kcgen]

@shermp - thanks for flagging this!