[OS-BUILD PATCHv15 0/5] [redhat] Add GIT macro to Makefile and Makefile.common:

[GitLab Bridge on behalf of bcrocker]

From: bcrocker on gitlab.com

Add a GIT macro to Makefile:

GIT ?= git

and replace literal occurrences of 'git' with $(GIT)\
in Makefile and Makefile.common.

This change enables us to override 'git' with, e.g., some\
arbitrary shell script that prints additional information\
and/or does additional processing before and/or after (or\
even instead of) invoking /usr/bin/git.

Signed-off-by: Ben Crocker