Separate the required CPPFLAGS from environment overridable CFLAGS.
Change-Id: I0c1c0a1cebc7f7971634bf57d4a2370939c43fda
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/20175
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Hannah Williams <hannah.williams@intel.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
cce508fed2