Introduce a new config variable OPT_WHOLE_PROGRAM for
Microsoft builds to control compiler and linker flags.
Static builds with MSVS-2010 don't work properly with
whole-program optimization enabled; this lets the static
targets be built with normal optimization enabled and
just the whole-program flags turned off.
This commit also makes the CONFIG file for Microsoft
builds more like the 3.15 version.
994cf0ff07