fix(relinker): bind Linux guest imports by declared module identity

[exefer]

What

On Linux, any executable import or guest-module import whose NID two bundled modules export is a hard error, even when the import declares one of them. Windows already binds such imports to their declared module (#684).

Executable imports shared between providers bind when exactly one provider's filename or SONAME is in the executable's DT_NEEDED list. Guest-module imports shared between providers bind when the declared library resolves to one of the providers, on both platforms (the Windows-only filter already did this on Windows). Anything else still throws as before: undeclared, host-declared and multiply-declared imports are unchanged.

Demonstrated by Wobbly Life (PPSA29413, Unity; bring-up: #2211): its executable imports M4YYbSFfJ8g declared from the needed Il2cppUserAssemblies.prx while Media/Plugins/kitt_support-PS5-shipping.prx incidentally exports the same NID, and kitt_webkit-PS5-shipping.prx imports smbQukfxYJM declared from kitt_support.prx while Il2cppUserAssemblies.prx exports it too.

Tested

• Linux (CachyOS), GCC 16.2.1, Intel i5-12400 + NVIDIA RTX 3060 Ti (615.71.09), ANYPS5_RELINKER_ONLY=ON, BUILD_TESTING=ON: 110/110 relinker tests pass, including the existing ambiguity regressions (fixtures declare nothing, so they still throw).
• PPSA29413 relinked with --registry --module-dir Media/Plugins --module-dir Media/Modules --to-intel: converts all bundled, needed and plugin modules (was: hard error). Note: current main no longer discovers needed modules outside the module directories (41126bf), so Media/Modules is now passed explicitly like Media/Plugins.

Checklist

• Based on current main; no other open PR implements the same functions (checked: fix(relinker): bind Windows imports to their declared modules #684 is Windows-only, fix(relinker): keep Linux imports declared from host modules off guest exports #1529 covers host-vs-guest, fix(relinker): discover required guest module identities #1503 covers identities, none binds Linux guest-vs-guest by declared module)
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw; no silent stubs added
• No notes, investigation files or images added to the repository
• No new third-party code
• Generic behaviour, not specific to one title
• Depends on: none
• AI-assisted: yes

[rmz-24]

Windows run: Windows 11 Pro 25H2 (10.0.26200.9457), RTX 5060 Ti (NVIDIA 617.42), MinGW-w64 GCC 15.2.0 (WinLibs r7), Release, -DANYPS5_ENABLE_SPIRV_TOOLS=ON, full build plus libs. ea73d5e cherry-picked onto current main d70b899 (applies cleanly).

• guest_module_identity, guest_symbol_names, guest_module_dir and guest_module_directories pass, with their Windows PE execution branches.
• Full ctest: 512/512.

AI-assisted: yes

[SleglJan]

A second title for this, on Linux (CachyOS, kernel 7.2.9, GCC 16.2.1): Until Dawn (PPSA15421 v01.005.000, Unreal, 7 Sony modules in sce_module/ and 28 Wwise plugins in prx/), relinker --registry on the unwrapped executable in all three cases:

• main f8c2f07: refused with Ambiguous guest import BfBDZGbti7A (sceAgcGetIsTrinityMode, declared from libSceAgc), exported by both bundled libSceFontGsm.prx and libSceJobManager.prx: the host-declared case fix(relinker): keep Linux imports declared from host modules off guest exports #1529 covers.
• The carried feat(relinker): add --module-dir for modules loaded at run time #846, fix(relinker): discover required guest module identities #1503 and fix(relinker): keep Linux imports declared from host modules off guest exports #1529 on d70b899 without the last commit (2d262e8, a relinker-only build): refused with Ambiguous guest import P330P3dFF68 (Need_sceLibc, declared from libc.prx), exported by libc.prx and all 27 ak*/auro/masteringsuite plugins in prx/; only libc.prx is among the executable's DT_NEEDED entries, which is the rule this PR adds.
• ea73d5e (Release build, full): relinks with all 35 guest modules (prx/ is scanned as on main; passing --module-dir prx as well is refused as a duplicate directory), 644 imports implemented, 54 throwing stubs, 1 absent import. Given 8 s in a bubblewrap sandbox, the host loader stops at that absent import, sceAudioPropagationSourceSetAudioPath (tKSmk2JsMAA, the export fix(audio): recognize individual propagation path import #1947 adds), so both ambiguities are gone.

AI-assisted: yes (Claude Code).

[adriadam10]

Checked on Linux, merged onto current main: relinker build and ctest 99/99 pass. Windows 512/512 and a second title (Until Dawn) are reported above.

The PR had no test, so I added one commit on top:

• test_guest_symbol_names.py: two guest modules export the same NID. With only one in DT_NEEDED and the import declared from it, the relink succeeds and the import becomes NID#guest. With both in DT_NEEDED, it still throws Ambiguous guest import. The test fails with the GuestModuleBuilder.cpp change reverted.

Merging.