Configure: accept spaces in PATH. #43

Job	Run time
buildbot / check-if-allowed	1s
buildbot / ubuntu-22.04, amd64, asan, njs	2m 40s
buildbot / ubuntu-22.04, amd64, msan	4m 20s
buildbot / ubuntu-22.04, amd64, asan, quickjs	3m 24s
buildbot / alpine-3.19, amd64	4m 3s
buildbot / debian-12, amd64, print	56s
buildbot / alpine-3.19, arm64	2m 55s
buildbot / amazonlinux-2, amd64	2m 22s
buildbot / amazonlinux-2, arm64	1m 56s
buildbot / amazonlinux-2023, amd64	5m 22s
buildbot / amazonlinux-2023, arm64	4m 25s
buildbot / debian-11, amd64	2m 51s
buildbot / debian-11, arm64	2m 8s
buildbot / debian-12, amd64	3m 17s
buildbot / debian-12, arm64	2m 47s
buildbot / freebsd-14, amd64	2m 59s
buildbot / rhel-8, amd64	2m 51s
buildbot / rhel-8, arm64	2m 1s
buildbot / rhel-9, amd64	5m 15s
buildbot / rhel-9, arm64	4m 30s
buildbot / sles-12, amd64	3m 11s
buildbot / ubuntu-20.04, amd64	3m 20s
buildbot / ubuntu-20.04, arm64	2m 9s
buildbot / ubuntu-22.04, amd64	4m 32s
buildbot / ubuntu-22.04, arm64	3m 51s
buildbot / ubuntu-24.04, amd64	5m 40s
buildbot / ubuntu-24.04, arm64	4m 46s
buildbot / debian-12, x86	3m 41s
	1h 32m 13s

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