More fixes for mingw build/install.
Scons update for mingw.
Added fieldcomb.csh to SCons install.
Removed SPEED from SCons. Changes to build with mingw, as suggested by Francesco Anselmo.
SCons: Removed getpagesize.c from RAD_COMPAT, added RAD_SOCKETLIB.
Removed more obsolete stuff, added pcwarp again.
Removed obsolete files and programs from SCons build.
Compatibility fixes as suggested by Siegbert Debatin.
SCons build simplifications.
x11findwin.c needed the X11 include path.
Updated SCons build environment to work with a fresh download and on OS X, as suggested by Randolph Fritz.
Continued ANSIfication, and other fixes and clarifications.
Continued ANSIfication.
Experimental SCons update: Debug builds, split libraries, more Windows targets.
Checking in experimental SCons build environment.
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