Blender Git Loki

This is a modified version of patch #4200

http://projects.blender.org/tracker/index.php?func=detail&aid=4200&group_id=9&atid=127

It adds platform depenant prefix to function calls
(extern on non windows platforms more complicated on windows)
So that windows plugins can reference functions inside of blender.

there is a small TODO still...
Make release should build the helper library required under windows and modify
how they build the plugins:
dlltool --input-def plugin.DEF --output-lib libblenerplugin.a --dllname blender.exe
and the pulgins should be made with:
gcc -c (pluginname).c
gcc -shared -o (pluginname).dll (pluginname).o libblenderplugin.a

Kent