add static binaries of mgba-rom-test

[SBird1337]

Adds static binaries for mgba-rom-test for windows and linux hosts.

Flags this is compiled with:

-DM_CORE_GB=OFF -DUSE_DISCORD_RPC=OFF -DUSE_EDITLINE=OFF -DUSE_EPOXY=OFF -DUSE_FFMPEG=OFF -DUSE_GDB_STUB=OFF -DUSE_LIBZIP=OFF -DUSE_LUA=OFF -DUSE_MINIZIP=OFF -DUSE_SQLITE3=OFF -DDISABLE_FRONTENDS=ON -DBUILD_ROM_TEST=ON -DBUILD_STATIC=ON -DBUILD_SHARED=OFF -DBUILD_GLES3=OFF -DUSE_ZLIB=OFF -DUSE_PNG=OFF

shared library requirements (linux):

 0x0000000000000001 (NEEDED)             Shared library: [libelf.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]

mgba is licensed under Mozilla Public License 2.0. (https://github.com/mgba-emu/mgba/blob/master/LICENSE) we should make sure not to violate it :)

TODO: Potentially stop the CI from building mgba from source but use the static build provided.