Port to ghcr.io/ps2homebrew/ps2homebrew:main (new PS2SDK + GCC 15)

[Copilot]

The project failed to build with the current ghcr.io/ps2homebrew/ps2homebrew:main Docker image due to breaking changes in the new PS2SDK and stricter GCC 15 behavior.

CI

• Container: ps2dev/ps2dev:v1.0 → ghcr.io/ps2homebrew/ps2homebrew:main
• Fix deprecated ::set-output → $GITHUB_OUTPUT
• Upgrade actions/checkout and upload-artifact to v4

New SDK header guards (NEWLIB_PORT_AWARE)

New SDK gates fileio.h/fileXio_rpc.h/io_common.h behind #ifndef NEWLIB_PORT_AWARE. Added #define NEWLIB_PORT_AWARE before those includes in all affected PS2 driver files.

API renames & type changes

• fio_dirent_t → io_dirent_t (browser.c)
• ee_thread_t → ee_thread_status_t for ReferThreadStatus (cd/cd.c)
• libjpg.h → libjpg_ps2_addons.h; jpgOpenFILE+jpgReadImage → jpgFromFILE which returns a jpgData* with buffer already populated

GCC 15 strictness fixes

• Implicit function declarations are now errors — added forward declarations for FCEUD_NetworkClose, FCEUD_SendData, FCEUD_RecvData, FCEUD_NetplayText (fceu.c, netplay.c)
• void FDSSound() conflicted with definition void FDSSound(int c) — GCC 15 treats () as (void) (fds.c)
• int true = 1; int false = 0; conflicts with stdbool.h now pulled in transitively — removed (cnfsettings.c)
• asprintf gated behind __GNU_VISIBLE — added #define _GNU_SOURCE (general.c)

libcdvd header conflicts

libcdvd-common.h defines #define CdCallback sceCdCallback etc., causing redefinition conflicts with local declarations in cdvd_iop.h. Replaced all local struct definitions and function declarations with typedefs to SDK types:

typedef sceCdRMode   CdRMode;
typedef sceCdlFILE   CdlFILE;
typedef sceCdlLOCCD  CdlLOCCD;
typedef sceCdCLOCK   CdCLOCK;

Kept only CdFlushCache and CdGetSize which are locally implemented.

Makefile

• Add -ljpeg_ps2_addons for jpgFromFILE
• Add -Wl,--allow-multiple-definition to resolve duplicate zlib symbols (bundled src/zlib/ vs system libz.a)