Use 'git clone' rather than 'svn export' throughout. #384

Job	Run time
Empty APLOGNO() test	51s
Default	4m 32s
All-static modules	4m 1s
Prefork MPM, all-modules (except cgid)	5m 51s
Worker MPM, all-modules	4m 55s
Shared MPMs, all-modules	4m 57s
Event MPM, all-modules, mod_cgid only	5m 31s
Event MPM, all-modules, no CMSG_DATA	4m 23s
Default, all-modules + install	4m 54s
Default, all-modules, random test order	5m 5s
GCC 10 maintainer-mode w/-Werror, install + VPATH	5m 50s
All-modules, APR 1.7.4, APR-util 1.6.3	4m 39s
APR 1.8.x, APR-util 1.7.x	2m 20s
Pool-debug	2m 6s
Shared MPMs (event), pool-debug, SSL/TLS variants	3m 10s
Shared MPMs (worker), pool-debug, SSL/TLS variants	3m 2s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	3m 47s
litmus WebDAV tests	2m 31s
Regenerate ap_expr	5m 44s
APR 1.7.4, APR-util 1.6.3, LDAP	4m 7s
APR trunk thread debugging	55s
UBSan	7m 2s
ASan	1m 58s
ASan, pool-debug	2m 29s
HTTP/2 test suite	40s
MOD_TLS test suite	2m 44s
	1h 38m 4s

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