Support for building bf-blender under windows with gcc (huge thanks to

Florian Eggenburger).

Full instructions are in doc/README.windows-gcc.

Main differences from Florian's patch:

- the 'lib' dir should now be the same level as the 'blender' dir (rather
than being a subdir of 'blender'). This is consistent with the other
platforms that bf-blender supports (tuhopuu will also adopt this convention
hopefully soon).

- the script 'free_windows-env.mk' is no longer needed ... see the
docs about how this is overcome (again, tuhopuu will hopefully
also follow this route soon).

- the dlltool dir has it's own Makefile that builds all of the
needed stub libraries from the dll's in cvs.

intern/python/freeze/makemakefile.py

@@ -25,11 +25,15 @@ def makemakefile(outfp, makevars, files, target):
 	for key in keys:
 		outfp.write("%s=%s\n" % (key, makevars[key]))
 
-        outfp.write("\n\ninclude nan_definitions.mk\n")
-        outfp.write("ifeq ($(OS),windows)\n")
-        outfp.write("  CC=$(NANBLENDERHOME)/source/tools/cygwin/cl_wrapper.pl\n")
-        outfp.write("  CFLAGS=-I$(NAN_PYTHON)/include/python$(NAN_PYTHON_VERSION) $(OPT)\n")
-        outfp.write("endif\n")
+		outfp.write("\n\ninclude nan_definitions.mk\n")
+		outfp.write("ifeq ($(OS),windows)\n")
+		outfp.write("  CFLAGS=-I$(NAN_PYTHON)/include/python$(NAN_PYTHON_VERSION) $(OPT)\n")
+		outfp.write("  ifneq ($(FREE_WINDOWS),true)\n")
+		outfp.write("  	 CC=$(NANBLENDERHOME)/source/tools/cygwin/cl_wrapper.pl\n")
+		outfp.write("  else\n")
+		outfp.write("    CFLAGS += -mwindows -mno-cygwin\n")
+		outfp.write("  endif\n")
+		outfp.write("endif\n")
 
 	outfp.write("\nall: %s\n\n" % libtarget)