VC++ users: new proposed requirement for GNU make

[Warren Young]

The recent changeover to the makemake system hasn't been received 
uncritically.  Some of the problems people have with it could be fixed 
if I mandated the use of GNU make.  It allows Makefiles that are much 
more expressive than supported by Microsoft's nmake.

There are several sources for GNU make for Win32, so I don't see how 
anyone can claim this prereq as a hardship.  If you disagree, let me 
know...I'm not set on this course yet.