Makefile.inc: Stop running git repeatedly for each build

Currently, the coreboot makefiles repeatedly run git to try to set
the KERNELVERSION variable and to fetch the submodules.  This happens
three times for every build.  By exporting a variable, we can catch
this on recursive makes and not run each of these steps again.

Change-Id: I85ab867b40e80c36bd94d48510ffe3252c6cf93f
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14392
Tested-by: build bot (Jenkins)
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>

0 files changed, 0 insertions, 0 deletions