Fixed case for Linux.

CMakeLists.txt

@@ -75,6 +75,6 @@ IF(POLYCODE_BUILD_PLAYER)
 ENDIF(POLYCODE_BUILD_PLAYER)
 
 IF(POLYCODE_BUILD_TOOLS)
-    FIND_PACKAGE(ASSIMP REQUIRED)
+    FIND_PACKAGE(Assimp REQUIRED)
     ADD_SUBDIRECTORY(Tools/Contents)
 ENDIF(POLYCODE_BUILD_TOOLS)