Revert "src/Kconfig: Don't treat warns as errors on Clang builds yet"

This reverts commit 9b63c9bde2fc3b3a2d42e68618e043cf282bc566.

Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Change-Id: I4f547d20c5096877b2010602a087e41702939f77
Reviewed-on: http://review.coreboot.org/7506
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
1 file changed