FreeBSD/src 17c12f6 (r351429)sys/conf kern.pre.mk kmod.mk

Turn off -Werror for gcc 4.2.1

As part of marching gcc 4.2.1 out of the tree, turn off -Werror on gcc 4.2.1
compiles by default. It generates too many false positives and breaks CI
for no benefit.

Discussed on: arch@
Reviewed by: jhb@, emaste@, pfg@
Differential Revision: https://reviews.freebsd.org/D21378
DeltaFile
+5-1sys/conf/kern.pre.mk
+5-0sys/conf/kmod.mk
+10-12 files

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