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.

source/blender/blenlib/intern/rand.c

@@ -36,7 +36,7 @@
 #include <config.h>
 #endif
 
-#ifdef WIN32
+#if defined(WIN32) && !defined(FREE_WINDOWS)
 typedef unsigned __int64	r_uint64;
 #else
 typedef unsigned long long	r_uint64;

source/blender/blenlib/intern/winstuff.c

@@ -134,6 +134,7 @@ static void strnlower (char *str, int n) {
 	}
 }
 
+#ifndef FREE_WINDOWS
 int strcasecmp (char *s1, char *s2) {
 	char *st1, *st2;
 	int r;
@@ -174,6 +175,7 @@ int strncasecmp (char *s1, char *s2, int n) {
 
 	return r;	
 }
+#endif
 
 DIR *opendir (const char *path) {
 	if (GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY) {