Backport to v2.4: #612

Job	Run time
Empty APLOGNO() test	37s
Default	3m 51s
All-static modules	4m 11s
Prefork MPM, all-modules (except cgid)	4m 8s
Worker MPM, all-modules	5m 44s
Shared MPMs, all-modules	4m 28s
Event MPM, all-modules, mod_cgid only	4m 1s
Event MPM, all-modules, no CMSG_DATA	4m 10s
Default, all-modules + install	4m 11s
Default, all-modules, random test order	4m 20s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 31s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 56s
APR 1.8.x, APR-util 1.7.x	6m 12s
Pool-debug	6m 52s
Shared MPMs (event), pool-debug, SSL/TLS variants	8m 29s
Shared MPMs (worker), pool-debug, SSL/TLS variants	9m 4s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	8m 33s
litmus WebDAV tests	2m 14s
APR 1.7.4, APR-util 1.6.3, LDAP	6m 34s
APR trunk thread debugging	4m 29s
ASan	6m 21s
ASan, pool-debug	6m 59s
HTTP/2 test suite	13m 7s
MOD_TLS test suite	6m 38s
	2h 14m 40s

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