Backport to v2.4: #434

Job	Run time
Empty APLOGNO() test	33s
Default	4m 45s
All-static modules	3m 50s
Prefork MPM, all-modules (except cgid)	5m 4s
Worker MPM, all-modules	5m 57s
Shared MPMs, all-modules	4m 33s
Event MPM, all-modules, mod_cgid only	5m 31s
Event MPM, all-modules, no CMSG_DATA	4m 33s
Default, all-modules + install	5m 24s
Default, all-modules, random test order	4m 48s
GCC 10 maintainer-mode w/-Werror, install + VPATH	4m 46s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 47s
APR 1.8.x, APR-util 1.7.x	6m 40s
Pool-debug	9m 16s
Shared MPMs (event), pool-debug, SSL/TLS variants	9m 30s
Shared MPMs (worker), pool-debug, SSL/TLS variants	11m 9s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	10m 26s
litmus WebDAV tests	2m 32s
APR 1.7.4, APR-util 1.6.3, LDAP	4m 33s
APR trunk thread debugging	6m 36s
ASan	9m 19s
ASan, pool-debug	8m 32s
HTTP/2 test suite	15m 20s
MOD_TLS test suite	9m 3s
	2h 38m 27s

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