[coreboot-gerrit] Patch merged into coreboot/master: 90105d5 Only update submodules if the source is in a git repo

the following patch was just integrated into master:
commit 90105d546826498603eb6db1999ada92dca08b82
Author: Martin Roth 
Date:   Thu Feb 12 19:34:11 2015 -0700

Only update submodules if the source is in a git repo

This change just adds a check to verify that the build is happening
    inside a git repo and that git is a valid command before trying
    to update the submodules.

Use 'command -v' instead of 'which' to stay portable.

Change-Id: Idfa27645c3dbfd684f90002ecb01626d71eacc8f
    Signed-off-by: Martin Roth 
    Reviewed-on: http://review.coreboot.org/8427
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi 
    Reviewed-by: Paul Menzel

See http://review.coreboot.org/8427 for details.

-gerrit