MFC r241311:

Change 32-bit library builds by removing use of make -E and passing AS,
CC, CXX and LD on the commandline of the sub-make instead of in the
environment of the sub-make.
MFC r245561,245885:

Add a new LIBRARIES_ONLY make variable to disable the build and install
of files other than the actual libraries.

Use LIBRARIES_ONLY to supress the inclusion of files in the lib32
distribution that are duplicates of files in base.

Sponsored by:	DARPA, AFRL
Reviewed by:	emaste
MFC r245571,245580:

In preparation for logging metadata about each filesystem object,
refactor the link section of distrib-dirs to alwasy install to a full
path (the link contents remain relative as they should).

Eliminate the use of the "rm -r[f] <foo>; ln -s <bar> <foo>" pattern in
favor of "ln -sfh <bar> <foo>".  None of these links could be directories
on a system installed in the last decade.

Sponsored by:   DARPA, AFRL