Brooks Davis 2e1dfb346f Support SUBDIR.${MK_FOO}.${MK_BAR} expresssions.
This allows simplification of Makefiles where some SUBDIR entries depend
on two things (e.g. something that depends on C++ and some other knob).

Discussed with:	imp, jhb
Obtained from:	CheriBSD
MFC after:	3 days
Sponsored by:	DARPA
2020-03-17 18:17:32 +00:00
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