Patch merged into coreboot/master: genbuild_h.sh: allow coreboot to be a git submodule

the following patch was just integrated into master:
commit 2ab652f60624d5e46a14207b4428433ba2735f03
Author: Ben Gardner 
Date:   Thu Dec 31 12:13:43 2015 -0600

genbuild_h.sh: allow coreboot to be a git submodule

When coreboot is pulled in as a submodule, the .git "folder" is a file,
    not a folder.  Use the '-e' test instead of '-d' to allow for that.

Change-Id: I0dd8866b0016f7ba099cdaf4d7db442ff22612b5
    Signed-off-by: Ben Gardner 
    Reviewed-on: https://review.coreboot.org/12819
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Patrick Georgi

See https://review.coreboot.org/12819 for details.

-gerrit