FreeBSD/src 707b2d6 (r348241). Makefile

Modernize the MAKE_JUST_KERNELS hint in the top-level makefile.

It doesn't make sense to limit to -j12 anymore, build scalability
is better than it used to be.  Fold the hint into the description
of the universe target.

Reviewed by:    imp
MFC after:      1 week
Differential Revision:  https://reviews.freebsd.org/D20342
DeltaFile
+2-7Makefile
+2-71 files

UnifiedSplitRaw