Merge from trunk: #477

Job	Run time
Empty APLOGNO() test	28s
Default	4m 2s
All-static modules	4m 40s
Prefork MPM, all-modules (except cgid)	6m 14s
Worker MPM, all-modules	5m 37s
Shared MPMs, all-modules	5m 18s
Event MPM, all-modules, mod_cgid only	4m 25s
Event MPM, all-modules, no CMSG_DATA	4m 45s
Default, all-modules + install	5m 17s
Default, all-modules, random test order	4m 37s
GCC 10 maintainer-mode w/-Werror, install + VPATH	4m 13s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 22s
APR 1.8.x, APR-util 1.7.x	6m 57s
Pool-debug	6m 51s
Shared MPMs (event), pool-debug, SSL/TLS variants	9m 30s
Shared MPMs (worker), pool-debug, SSL/TLS variants	11m 6s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	11m 55s
litmus WebDAV tests	2m 46s
APR 1.7.4, APR-util 1.6.3, LDAP	6m 23s
APR trunk thread debugging	5m 25s
ASan	7m 51s
ASan, pool-debug	9m 52s
HTTP/2 test suite	16m 25s
MOD_TLS test suite	9m 32s
	2h 39m 31s

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