Remove local definition of PATH_MAX if macro was missing.
PATH_MAX is used in many other places within the source without these definitions; while technically optional in POSIX1.2008 I have not seen anywhere that does not set it, and if such a system exists it'll be needed elsewhere and the build system should handle it. Also, POSIX1.2008 states this must be at least 1024, not 256 as used here.
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