add webOS to Makefile

[cscd98]

This allows compilation for webOS

Note i've had to add INCFLAGS/LDFLAGS to build, as GCC 14 doesn't seem to find them otherwise.

Also these are the libs are built:

find ./ -name *.a
./deps/sdl/os2/lib/FSLib.a
./deps_bin/vorbis_build/lib/libvorbisenc.a
./deps_bin/vorbis_build/lib/libvorbis.a
./deps_bin/vorbis_build/lib/libvorbisfile.a
./deps_bin/ogg_build/libogg.a
./deps_bin/libsndfile_build/libsndfile.a
./deps_bin/opus_build/libopus.a
./deps_bin/fluidsynth_build/src/libfluidsynth.a
./deps_bin/flac_build/src/test_libs_common/.libs/libtest_libs_common.a
./deps_bin/flac_build/src/libFLAC/.libs/libFLAC.a
./deps_bin/flac_build/src/libFLAC/.libs/libFLAC-static.a
./deps_bin/flac_build/src/share/grabbag/.libs/libgrabbag.a
./deps_bin/flac_build/src/share/replaygain_synthesis/.libs/libreplaygain_synthesis.a
./deps_bin/flac_build/src/share/getopt/.libs/libgetopt.a
./deps_bin/flac_build/src/share/replaygain_analysis/.libs/libreplaygain_analysis.a
./deps_bin/flac_build/src/share/utf8/.libs/libutf8.a
./deps_bin/munt_build/libmt32emu.a
./deps_bin/lib/libfluidsynth.a
./deps_bin/lib/libogg.a
./deps_bin/lib/libvorbisenc.a
./deps_bin/lib/libopus.a
./deps_bin/lib/libvorbis.a
./deps_bin/lib/libsndfile.a
./deps_bin/lib/libFLAC.a
./deps_bin/lib/libvorbisfile.a
./deps_bin/lib/libmt32emu.a

Which is missing libmpg123.a and libopusfile.a, referenced in Makefile.libretro. Are they needed?