Linux

CI: try caching rustls build in ~/root/rustls #738

Job	Run time
Empty APLOGNO() test	36s
Default	4m 57s
All-static modules	4m 5s
Prefork MPM, all-modules (except cgid)	4m 20s
Worker MPM, all-modules	3m 55s
Shared MPMs, all-modules	3m 57s
Event MPM, all-modules, mod_cgid only	3m 54s
Event MPM, all-modules, no CMSG_DATA	3m 55s
Default, all-modules + install	4m 23s
Default, all-modules, random test order	4m 9s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 8s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 26s
APR 1.8.x, APR-util 1.7.x	6m 55s
Pool-debug	7m 25s
Shared MPMs (event), pool-debug, SSL/TLS variants	8m 29s
Shared MPMs (worker), pool-debug, SSL/TLS variants	8m 59s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	9m 3s
litmus WebDAV tests	2m 46s
litmus WebDAV tests, APR trunk, LMDB	2m 14s
Regenerate ap_expr	4m 12s
APR 1.7.4, APR-util 1.6.3, LDAP	5m 14s
APR trunk thread debugging	4m 34s
UBSan	4m 45s
ASan	6m 34s
ASan, pool-debug	6m 51s
HTTP/2 test suite	11m 56s
MOD_TLS test suite	5m 7s
Configured w/reduced exports	2m 2s
	2h 23m 51s

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