genbuild_h: Add Mac OS to case of "data -r"

Change-Id: I2a43a1b1749da207b7a23b8eb252c13605121533
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/11599
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed