[PHP] fix: align pathconf constants with libc#752
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Supersedes fork-headed PR #732. This replacement keeps the same head commit (f975ced) but moves the PR head onto an Automattic/kandelo branch.
Why this is needed
PHP and libc tests query pathconf values and compare them to libc-visible constants. Mismatched constants make userland observe inconsistent filesystem limits.
Why this shape makes sense
The kernel and libc-facing constants need to agree. Fixing the constants at the platform boundary prevents package-specific expectations from drifting.
Why this is the correct fix
Aligning pathconf constants with libc makes the syscall result match what compiled userland was built to understand.
Verification
Branch-location correction only. Replacement head SHA matches fork-headed PR #732 exactly.