libopusenc v0.3

Changes

• Fix ope_encoder_drain() assertion failures
• Fix use of unitialized fields
• Fix undefined behaviour in picture.c
• Fix crash with WIN32_LEAN_AND_MEAN on 64-bit Windows
• Fix various warnings under C23
• Drop use of private __opus_check_* macros
• Port update_version from bash to sh
• Clean up documentation files

SHA-2 256 checkums

f616d3aff9b2034547894ccb8ab56c36cf1a4acb0d922c5d7119f97bbe58642c  libopusenc-0.3.tar.gz