Print config.mak to aid confirmation/verification of settings

Having the output of the config.mak file in the build output is very
convenient, particularly when building in koji or copr where it is not
possible to directly access the buildroot.

git.spec

@@ -501,6 +501,9 @@ GIT_TEST_OPTS = -x --verbose-log
 TEST_SHELL_PATH = /bin/bash
 EOF
 
+# Print config.mak to aid confirmation/verification of settings
+cat config.mak
+
 # Filter bogus perl requires
 # packed-refs comes from a comment in contrib/hooks/update-paranoid
 %if %{use_new_rpm_filters}