h2 websockets backport for 2.4.x #381

Job	Run time
Empty APLOGNO() test	37s
Default	5m 5s
All-static modules	5m 7s
Prefork MPM, all-modules (except cgid)	5m 56s
Worker MPM, all-modules	4m 49s
Shared MPMs, all-modules	5m 17s
Event MPM, all-modules, mod_cgid only	4m 22s
Event MPM, all-modules, no CMSG_DATA	4m 29s
Default, all-modules + install	5m 35s
Default, all-modules, random test order	4m 33s
GCC 10 maintainer-mode w/-Werror, install + VPATH	4m 27s
All-modules, APR 1.7.4, APR-util 1.6.3	6m 10s
APR 1.8.x, APR-util 1.7.x	6m 42s
Pool-debug	7m 1s
Shared MPMs (worker), pool-debug, SSL/TLS variants	10m 35s
Shared MPMs (event), pool-debug, SSL/TLS variants	9m 46s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	10m 29s
litmus WebDAV tests	3m 3s
APR 1.7.4, APR-util 1.6.3, LDAP	4m 25s
APR trunk thread debugging	5m 6s
ASan	7m 35s
ASan, pool-debug	8m 15s
HTTP/2 test suite	14m 10s
MOD_TLS test suite	7m 48s
	2h 31m 22s

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