README.win32: document build instructions

README.win32

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+Windows Setuptools Build Instructions
+======================================
+
+  1. Install gtk+ bundle from gtk.org (to C:\GTK for example)
+  2. Install libxml2 and gtksourceview into the gtk+ installation
+  3. Install Python2.6
+  4. Install pycairo, pygobject and pygtk
+  5. Install MinGW and MSYS
+  6. Add the following to your msys environment variables
+     (open and append to C:\msys\1.0\etc\profile) or set for the session
+
+     $ export PATH=/c/GTK/bin:/c/Python26:/c/Python26/Scripts:$PATH
+     $ export PKG_CONFIG_PATH=/c/GTK/lib/pkgconfig:/c/Python26/Lib/pkgconfig:$PKG_CONFIG_PATH
+
+  7. In msys shell, build with
+
+     $ python setup.py build --compiler=mingw32 --enable-threading bdist_wininst --user-access-control=auto
+
+Tested with
+  * gtk+-bundle_2.20.0-20100406_win32.zip
+  * MinGW-5.16.exe
+  * MSYS-1.0.11.exe
+  * python-2.6.5.exe
+  * pycairo-1.8.6.win32-py2.6.exe