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