Remove unnecessary references to r->user within ldap-search. #619

Job	Run time
Empty APLOGNO() test	24s
Default	4m 7s
All-static modules	3m 31s
Prefork MPM, all-modules (except cgid)	3m 54s
Worker MPM, all-modules	3m 54s
Shared MPMs, all-modules	3m 57s
Event MPM, all-modules, mod_cgid only	4m 1s
Event MPM, all-modules, no CMSG_DATA	5m 33s
Default, all-modules + install	4m 17s
Default, all-modules, random test order	3m 51s
GCC 10 maintainer-mode w/-Werror, install + VPATH	59s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 34s
APR 1.8.x, APR-util 1.7.x	5m 35s
Pool-debug	6m 8s
Shared MPMs (event), pool-debug, SSL/TLS variants	8m 57s
Shared MPMs (worker), pool-debug, SSL/TLS variants	9m 2s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	9m 5s
litmus WebDAV tests	2m 12s
litmus WebDAV tests, APR trunk, LMDB	1m 59s
Regenerate ap_expr	49s
APR 1.7.4, APR-util 1.6.3, LDAP	6m 53s
APR trunk thread debugging	4m 16s
UBSan	4m 43s
ASan	6m 15s
ASan, pool-debug	6m 43s
HTTP/2 test suite	11m 57s
MOD_TLS test suite	4m 47s
	2h 13m 23s

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