Scons update for mingw.
Removed SPEED from SCons. Changes to build with mingw, as suggested by Francesco Anselmo.
Turned bmalloc.c into a standard module.
SCons build simplifications.
Updated SCons build environment to work with a fresh download and on OS X, as suggested by Randolph Fritz.
Experimental SCons update: Debug builds, split libraries, more Windows targets.
Checking in experimental SCons build environment.
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