mod_xml2enc: remove dependency on xmlstring header #614

Job	Run time
Empty APLOGNO() test	46s
Default	3m 30s
All-static modules	3m 58s
Prefork MPM, all-modules (except cgid)	4m 11s
Worker MPM, all-modules	3m 53s
Shared MPMs, all-modules	4m 2s
Event MPM, all-modules, mod_cgid only	3m 47s
Event MPM, all-modules, no CMSG_DATA	3m 49s
Default, all-modules + install	4m 2s
Default, all-modules, random test order	3m 55s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 18s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 30s
APR 1.8.x, APR-util 1.7.x	5m 27s
Pool-debug	5m 58s
Shared MPMs (event), pool-debug, SSL/TLS variants	9m 6s
Shared MPMs (worker), pool-debug, SSL/TLS variants	9m 55s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	9m 16s
litmus WebDAV tests	2m 7s
litmus WebDAV tests, APR trunk, LMDB	2m 18s
Regenerate ap_expr	4m 6s
APR 1.7.4, APR-util 1.6.3, LDAP	5m 33s
APR trunk thread debugging	4m 49s
UBSan	4m 36s
ASan	6m 16s
ASan, pool-debug	6m 48s
HTTP/2 test suite	12m 9s
MOD_TLS test suite	5m 22s
	2h 18m 27s

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