build: use CFLAGS_* in more places where they're needed

After moving out -m32 from CC_*, 64bit compilers need
CFLAGS_* in more places to handle everything in 32bit
as appropriate.

Change-Id: I692a46836fc0ba29a3a9eb47b123e3712691b45d
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/5789
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
5 files changed