Draft: redhat: fix make {distg-brew,distg-koji}

Bugzilla: http://bugzilla.redhat.com/2037486 Upstream-status: RHEL-only

When Makefile.common is included from makefiles other than the main one, the GIT macro is not defined, resulting in build fail.

This commit moves the GIT macro definition to the Makefile.common itself, thus making it defined for each makefile including it.

As a bonus, let's use the GIT macro in koji/Makefile, too.

Co-developed-by: Timothy Redaelli tredaelli@redhat.com Signed-off-by: Andrea Claudi aclaudi@redhat.com