bash: Ensure deterministic build

Bash keeps a count of the number of times make was invoked on a directory
and changes the output versioning accordingly. We want deterministic output
so disable this behaviour.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 13a039e0)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>