Stabilize legacy packages for GCC 15 / C23 compatibility

[frangarcj]

This PR addresses the build failures in 10 packages caused by the transition to GCC 15 and C23.

Changes:

• Forced -std=gnu11 / -std=gnu++11: Restores old-style function prototype behavior to prevent errors with getopt, getenv, etc.
• Compatibility Flags: Added -Wno-error=implicit-function-declaration and -Wno-error=int-conversion to all failing packages.
• Pixman Assembler Fix:
  • Replaced | with + in macros (fix for new ARM GAS comment interpretation).
  • Fixed numeric labels with leading zeros (01f -> 1f) which are no longer supported.

Affected Packages:

• taipool, opus, openal-soft, libconfig (CMake)
• pixman, lame, libmpeg2, onigmo (Autotools)
• bzip2, libftpvita (Makefile)

[d3m3vilurr]

python2 failed

/usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/bin/ld: /usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/lib/libcrypto.a(threads_pthread.o): in function `CRYPTO_THREAD_lock_new':
(.text+0x36): undefined reference to `pthread_rwlock_init'
/usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/bin/ld: /usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/lib/libcrypto.a(threads_pthread.o): in function `CRYPTO_THREAD_read_lock':
(.text+0x5e): undefined reference to `pthread_rwlock_rdlock'
/usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/bin/ld: /usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/lib/libcrypto.a(threads_pthread.o): in function `CRYPTO_THREAD_write_lock':
(.text+0x6e): undefined reference to `pthread_rwlock_wrlock'
/usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/bin/ld: /usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/lib/libcrypto.a(threads_pthread.o): in function `CRYPTO_THREAD_unlock':
(.text+0x7e): undefined reference to `pthread_rwlock_unlock'
/usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/bin/ld: /usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/lib/libcrypto.a(threads_pthread.o): in function `CRYPTO_THREAD_lock_free':
(.text+0x92): undefined reference to `pthread_rwlock_destroy'
/usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/bin/ld: /usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/lib/libcrypto.a(threads_pthread.o): in function `CRYPTO_THREAD_run_once':
(.text+0xae): undefined reference to `pthread_once'
/usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/bin/ld: /usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/lib/libcrypto.a(threads_pthread.o): in function `openssl_init_fork_handlers':
(.text+0x12e): undefined reference to `pthread_once'
/usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/bin/ld: /usr/local/vitasdk/bin/../lib/gcc/arm-vita-eabi/15.2.0/../../../../arm-vita-eabi/lib/libcrypto.a(threads_pthread.o): in function `fork_once_func':
(.text+0x18): undefined reference to `pthread_atfork'
collect2: error: ld returned 1 exit status
make: *** [Makefile:507: python] Error 1
==> ERROR: A failure occurred in package().
    Aborting...
Error: Process completed with exit code 2.