Merge branch 'rj/maint-test-fixes' into maint

* rj/maint-test-fixes: t9501-*.sh: Fix a test failure on Cygwin lib-git-svn.sh: Add check for mis-configured web server variables lib-git-svn.sh: Avoid setting web server variables unnecessarily t9142: Move call to start_httpd into the setup test t3600-rm.sh: Don't pass a non-existent prereq to test #15