Fix VIMAGE build.
Fix the comment introduced in r276192 so that it clearly
states that the change is needed to avoid a deadlock.

Suggested by:	kib
MFC after:	1 week
Replace CC_VAR with CCV, since the CC_VAR macro doesn't exist.
While here, add MLINK for CCV.9 and DECLARE_CC_MODULE.9.
Stylish changes... put tabs where they need to be in macros, move lines
around so that related things are more grouped together, rewrite comments.

No functional changes, this is all so that the functional changes in the
next commit will stand out.
Fix the GLOBAL macro so it works (upper vs lowercase X), use it in _EENTRY.
Create 'L' variants of all the ENTRY macros for file-static/local symbols.

If it seems like this is getting out of hand, I quite agree.  I wonder if
it's safe, here in the 21st century, to lose the distinction between C and
ASM symbols?
Merge remote-tracking branch 'freebsd/master' into hardened/current/master
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/libressl