arch dependent config
Scons: EZXML_NOMMAP for cygwin.
Scons update for mingw.
Removed SPEED from SCons. Changes to build with mingw, as suggested by Francesco Anselmo.
SCons: Removed getpagesize.c from RAD_COMPAT, added RAD_SOCKETLIB.
New mingw.cfg, and fixes to the other Windows configs.
Turned bmalloc.c into a standard module.
Experimental SCons update: Debug builds, split libraries, more Windows targets.
Checking in experimental SCons build environment.
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