don't merge slashes on perdir prefix #1105

Job	Run time
Empty APLOGNO() test	27s
Default	4m 42s
All-static modules	5m 8s
Prefork MPM, all-modules (except cgid)	5m 29s
Worker MPM, all-modules	5m 47s
Shared MPMs, all-modules	5m 40s
Event MPM, all-modules, mod_cgid only	5m 31s
Event MPM, all-modules, no CMSG_DATA	5m 15s
Default, all-modules + install	5m 34s
Default, all-modules, random test order	5m 17s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 9s
All-modules, APR 1.7.4, APR-util 1.6.3	6m 15s
APR 1.8.x, APR-util 1.7.x	6m 4s
Pool-debug	6m 19s
Shared MPMs (event), pool-debug, SSL/TLS variants	12m 0s
Shared MPMs (worker), pool-debug, SSL/TLS variants	9m 24s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	9m 10s
litmus WebDAV tests	3m 15s
litmus WebDAV tests, APR trunk, LMDB	3m 48s
Regenerate ap_expr	5m 18s
APR 1.7.4, APR-util 1.6.3, LDAP	5m 58s
APR trunk thread debugging	5m 51s
UBSan	5m 55s
ASan	6m 25s
ASan, pool-debug	7m 3s
HTTP/2 test suite	5m 54s
MOD_TLS test suite	3m 50s
Configured w/reduced exports	2m 17s
OpenSSL 3.1	7m 38s
OpenSSL 3.2 -Werror	8m 41s
OpenSSL 3.2 no-engine	8m 7s
OpenSSL 3.3 no-engine -Werror	9m 22s
	3h 10m 33s

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