MFC bmake-20170720

PR: 221023

bmake 20151220

Merge bmake-20151201

MFC bmake changes to stable/10 (r255285,r255916,r258113,r258114,r261212,r266760,r268437)

Discussed with: sjg

r255285:

If MAKE_JOB_ERROR_TOKEN is set to false, do not put an error token ("E")
into the job queue.
This avoids closing down an entire build on failure of one branch.
Probably has no use outside the context of universe/tinderbox.

Reviewed by: obrien

r255916:

Fix Fx syntax.

PR: 182269
Approved by: re@

r258113:

Avoid SEGV when passed NULL for list

r258114:

Don't SEGV when Hash_Table is uninitialized

r261212:

Merge bmake-20140101 from vendor

r266760:

Portmgr no longer need the UL hack.

Reviewed by: obrien

r268437:

Update to bmake-20140620
Main change is detection of malformed variable references.

Reviewed by: obrien

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Merge bmake-20130904

Merge bmake-20130730
Main feature of interest is .MAKE.JOB.PREFIX=
to suppress --- job --- tokens.

Sync with upstream version (20130520) that includes same fixes made last week.

Update to bmake-20130330

Merge bmake-20130123

Approved by: marcel (mentor)

Import bmake-20130123

Approved by: marcel (mentor)