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.

doc/README.windows-gcc

@@ -0,0 +1,91 @@
+Here are some basic instructions for building
+blender blender for windows using gcc under cygwin.
+Please note that the resulting executable does not
+depend on cygwin and can be distrubuted to machines
+that don't have cygwin installed.
+
+The instructions are:
+
+1. Download cygwin (www.cygwin.com) and use the setup program
+   to install packages for gcc, gcc-mingw, w32api, make, cvs,
+   python, and perl (and maybe others... the dependency list
+   is bound to change over time and hopefully these instructions
+   will keep with the changes). All of the following
+   commands will be entered at the cygwin prompt so launch
+   cygwin now.
+
+2. Create a directory to put your sources and then enter that
+   directory, e.g.:
+     mkdir bf-blender
+     cd bf-blender
+
+3. checkout the blender module from the bf-blender tree using cvs 
+   (use password anonymous):
+     cvs -d:pserver:anonymous@cvs.blender.org:/cvsroot/bf-blender login
+     cvs -z3 -d:pserver:anonymous@cvs.blender.org:/cvsroot/bf-blender \
+          co blender
+
+4. checkout the lib/windows module from bf-blender using cvs:
+     cvs -z3 -d:pserver:anonymous@cvs.blender.org:/cvsroot/bf-blender \
+          co lib/windows
+
+5. Enter the newly created blender directory:
+     cd blender
+
+6. to prepare the build system to use only the free tools we must
+   set some environment variables. This is done by creating a
+   file called "user-def.mk" in the blender directory and
+   inserting the following line with notepad or your favorite
+   text editor:
+       export FREE_WINDOWS=true
+
+   The quickest way to do this though is to issue the following
+   command:
+      echo 'export FREE_WINDOWS=true' > user-def.mk
+
+7. Time to build... issue the command:
+     make
+
+8. Wait for it to finish (there is this mysterious place called 
+   'outside' that I am told is nice to go to while waiting for a 
+   compile to finish).
+
+Getting Help
+------------
+If you have problems, come by #blendersauce on irc.freenode.net
+or post questions to the "Compiling, Libraries, Modules" forum
+at www.blender.org. There is also the very useful bf-committers 
+mailing list, what you can subscribe to here:
+
+http://www.blender.org/mailman/listinfo/bf-committers
+(as a bonus you can get info about the most recent features that
+are coming down the pipe ...)
+
+This said, the most common fix to a problem will
+probably involve installing an additional cygwin package,
+so keep that cygwin setup program close by ...
+
+Some final notes
+----------------
+
+- The build will take a long time, even on a fast machine
+  (a clean build takes almost an hour on my Athlon 1800+
+  based laptop).
+- If the build is successful you will find it has created
+  the program obj/windows/bin/blender.exe
+- Sound is disabled
+- If you want to clean your sources issue a 'make clean'
+  in the top blender directory.
+- If you want to update your sources when somebody has
+  added a new awesome feature, you will want to go to the
+  topmost blender directory and issue the following command:
+      cvs -z3 update -P -d
+  It would probably be best to clean your sources before
+  re-building (see previous note).
+- This is a work in progress, so some things may not be working
+  right or it may not support all of the cutting edge features.
+- Want to make a fancy zipped up blender package to give
+  to your buddies? Try "make release" ... read the output
+  to find out where the zip file was placed (note: you will
+  probably need the zip/unzip packages from cygwin to do
+  this)