ab: Map -c0 to -c<number of workers>. PR 69383 #1177

Job	Run time
Empty APLOGNO() test	24s
Default	3m 41s
All-static modules	3m 45s
Prefork MPM, all-modules (except cgid)	4m 11s
Worker MPM, all-modules	3m 54s
Shared MPMs, all-modules	4m 11s
Event MPM, all-modules, mod_cgid only	4m 1s
Event MPM, all-modules, no CMSG_DATA	4m 8s
Default, all-modules + install	4m 21s
Default, all-modules, random test order	4m 15s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 15s
All-modules, APR 1.7.4, APR-util 1.6.3	4m 10s
APR 1.8.x, APR-util 1.7.x	5m 52s
Pool-debug	6m 15s
Shared MPMs (event), pool-debug, SSL/TLS variants	9m 15s
Shared MPMs (worker), pool-debug, SSL/TLS variants	9m 47s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	9m 6s
litmus WebDAV tests	2m 2s
litmus WebDAV tests, APR trunk, LMDB	2m 54s
Regenerate ap_expr	4m 4s
APR 1.7.4, APR-util 1.6.3, LDAP	4m 18s
APR 1.7.x, APR-util 1.7.x, LDAP	5m 39s
APR trunk thread debugging	4m 45s
UBSan	5m 3s
ASan	6m 51s
ASan, pool-debug	7m 9s
HTTP/2 test suite	4m 58s
Configured w/reduced exports	2m 5s
OpenSSL 3.1	3m 36s
OpenSSL 3.2 -Werror	3m 58s
OpenSSL 3.2 no-engine	3m 16s
OpenSSL 3.3 no-engine -Werror	3m 51s
	2h 29m 0s

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