K 10
svn:author
V 8
bdrewery
K 8
svn:date
V 27
2016-11-13T00:11:02.575795Z
K 7
svn:log
V 332
Consolidate the "don't build" optimizations into _SKIP_BUILD.

_SKIP_BUILD will be set when nothing is expected to be built.  This can
be used to optimize some tree-walks and operations which don't need to
load dependency files or generate dependencies via beforebuild-style
hacks.

MFC after:	2 weeks
Sponsored by:	Dell EMC Isilon

END