Brooks Davis 02e65672b4 Add a guard for broken SUBDIR.${MK_FOO} use
Check for the variable SUBDIR. and error as it usually means someone
forgot to include src.opts.mk.

This guard from CheriBSD found the bugs in r367655 and r367728.

Reviewed by:	bdrewery, arichardson
Obtained from:	CheriBSD
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D27211
2020-11-16 19:15:11 +00:00
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