Added noboost targets to the XCode project file.

Thanks to Dario Accornero for the patch!

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@581 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

CREDITS

@@ -1,5 +1,3 @@
-
-
 ===============================================================
 Open Asset Import Library (Assimp)
 Developers and Contributors
@@ -82,3 +80,6 @@ Bugreport and fix for a obj-materialloader crash.
 
 - David Nadlinger
 D bindings, CMake install support.
+
+- Dario Accornero
+added no-boost targets to the XCode project.