build: support older git versions to detect current branch #2415
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Ubuntu 18.04 has git version 2.17.1 which doesn't have the --show-current
flag available (It's in a newer version of git). This causes builds to
throw an error when the makefile looks for the current branch. Go back to
the old method of parsing
git branchoutput to get the current branch.This fixes #2414.
Signed-off-by: James Peach [email protected]