K 10
svn:author
V 3
jah
K 8
svn:date
V 27
2018-01-27T20:13:36.655084Z
K 7
svn:log
V 1077
Remove system makefile path directives from env passed to PORTS_MODULES step

Previously, MAKESYSPATH as well as '-m' directives in MAKEFLAGS would cause
any port rebuilt during the PORTS_MODULES stage to consume system makefiles
from $(SRCROOT)/share/mk instead of those installed under /usr/share/mk.
For kernel modules that need to build against an updated src tree this
makes sense; less so for <bsd.port.mk> or  any userspace library or utility
the port may also happen to install.

Before 11.0, this probably didn't matter much in practice.  But the addition
of src.libnames.mk under $(SRCROOT)/share/mk in 11.0 breaks any consumer of
bsd.prog.mk and DPADD/LDADD during PORTS_MODULES.

Address the build breakage by removing MAKESYSPATH and any occurrence of
'-m' from MAKEFLAGS in the environment created for the port build.
Instead set SYSDIR so that any kmod built by the port will still consume
conf/kmod.mk from the updated src tree, assuming it uses <bsd.kmod.mk>

Reviewed by:	bdrewery
MFC after:	2 weeks
Differential Revision: 	https://reviews.freebsd.org/D13053

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