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Define a fallback PATH_MAX if not available #6

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Job	Run time
linux-asan	47s
freebsd	3m 4s
linux-msan	42s
Linux (Ubuntu)	1m 18s
linux-ubsan	1m 4s
macOS	20s
macos-asan	28s
macos-ubsan	21s
qemu-alpine (i386)	53s
qemu-alpine (arm32v6)	4m 54s
qemu-alpine (arm32v7)	5m 6s
qemu-alpine (arm64v8)	5m 12s
qemu-alpine (s390x)	5m 29s
	29m 38s