Fix autoconf warnings #1284

Job	Run time
Empty APLOGNO() test	1m 30s
autoconf warnings test	1m 53s
Default	3m 54s
All-static modules	3m 58s
Prefork MPM, all-modules (except cgid)	4m 16s
Worker MPM, all-modules	4m 18s
Shared MPMs, all-modules	5m 7s
Shared MPMs, all-modules, 64-bit ARM	6m 58s
Event MPM, all-modules, mod_cgid only	4m 14s
Event MPM, all-modules, no CMSG_DATA	4m 15s
Default, all-modules + install	4m 26s
Default, all-modules, random test order	4m 26s
GCC 12 maintainer-mode w/-Werror, install + VPATH	3m 57s
All-modules, APR 1.7.4, APR-util 1.6.3	4m 45s
APR 1.8.x, APR-util 1.7.x	6m 59s
Pool-debug	6m 27s
Shared MPMs (event), pool-debug, SSL/TLS variants	9m 26s
Shared MPMs (worker), pool-debug, SSL/TLS variants	10m 22s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	9m 19s
litmus WebDAV tests	2m 9s
litmus WebDAV tests, APR trunk, LMDB	2m 41s
Regenerate ap_expr	5m 6s
APR 1.7.4, APR-util 1.6.3, LDAP	5m 34s
APR 1.7.x, APR-util 1.7.x, LDAP	5m 45s
APR trunk thread debugging	4m 52s
UBSan	4m 53s
ASan	7m 10s
ASan, pool-debug	7m 20s
HTTP/2 test suite	7m 13s
Configured w/reduced exports	2m 6s
OpenSSL 3.1	3m 24s
OpenSSL 3.2 -Werror	4m 18s
OpenSSL 3.2 no-engine	3m 26s
OpenSSL 3.3 no-engine -Werror	4m 16s
	2h 50m 43s

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