Makefile.inc: Use 'Wmissing-include-dirs' command option

This is to warn if a user add to Makefile a path to nonexistent
directory.

Change-Id: I5a30c3830f30509deaaadc6eaeab0e17bc08565c
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70251
Reviewed-by: Erik van den Bogaert <ebogaert@eltan.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions