Merge branch 'jn/gitweb-test'

* jn/gitweb-test: gitweb/Makefile: Include gitweb/config.mak gitweb/Makefile: Add 'test' and 'test-installed' targets t/gitweb-lib.sh: Add support for GITWEB_TEST_INSTALLED gitweb: Move call to evaluate_git_version after evaluate_gitweb_config