Linux

* Improve comment to make the main thread more clear #1209

Job	Run time
Empty APLOGNO() test	28s
Default	4m 53s
All-static modules	4m 54s
Prefork MPM, all-modules (except cgid)	5m 20s
Worker MPM, all-modules	5m 20s
Shared MPMs, all-modules	5m 14s
Event MPM, all-modules, mod_cgid only	5m 8s
Event MPM, all-modules, no CMSG_DATA	5m 25s
Default, all-modules + install	5m 34s
Default, all-modules, random test order	5m 23s
GCC 14 maintainer-mode w/-Werror, install + VPATH	28s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 44s
APR 1.8.x, APR-util 1.7.x	6m 28s
Pool-debug	6m 2s
Shared MPMs (event), pool-debug, SSL/TLS variants	9m 53s
Shared MPMs (worker), pool-debug, SSL/TLS variants	10m 33s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	9m 45s
litmus WebDAV tests	3m 40s
litmus WebDAV tests, APR trunk, LMDB	4m 27s
Regenerate ap_expr	5m 6s
APR 1.7.4, APR-util 1.6.3, LDAP	7m 39s
APR 1.7.x, APR-util 1.7.x, LDAP	5m 33s
APR trunk thread debugging	6m 1s
UBSan	6m 28s
ASan	7m 9s
ASan, pool-debug	7m 5s
HTTP/2 test suite	5m 38s
Configured w/reduced exports	2m 4s
OpenSSL 3.1	7m 37s
OpenSSL 3.2 -Werror	8m 25s
OpenSSL 3.2 no-engine	7m 32s
OpenSSL 3.3 no-engine -Werror	8m 21s
	3h 9m 17s

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