Revert "Build Assimp from source"

This reverts commit a41fcbe7f4.

cmake/modules/FindASSIMP.cmake

@@ -0,0 +1,32 @@
+# - Try to find Assimp
+# Once done, this will define
+#
+# ASSIMP_FOUND - system has Assimp
+# ASSIMP_INCLUDE_DIR - the Assimp include directories
+# ASSIMP_LIBRARIES - link these to use Assimp
+FIND_PATH( ASSIMP_INCLUDE_DIR assimp/mesh.h
+  /usr/include
+  /usr/local/include
+  /opt/local/include
+  ${CMAKE_SOURCE_DIR}/includes
+  )
+FIND_LIBRARY( ASSIMP_LIBRARY assimp
+  /usr/lib64
+  /usr/lib
+  /usr/local/lib
+  /opt/local/lib
+  ${CMAKE_SOURCE_DIR}/lib
+  )
+IF(ASSIMP_INCLUDE_DIR AND ASSIMP_LIBRARY)
+  SET( ASSIMP_FOUND TRUE )
+  SET( ASSIMP_LIBRARIES ${ASSIMP_LIBRARY} )
+ENDIF(ASSIMP_INCLUDE_DIR AND ASSIMP_LIBRARY)
+IF(ASSIMP_FOUND)
+  IF(NOT ASSIMP_FIND_QUIETLY)
+    MESSAGE(STATUS "Found ASSIMP: ${ASSIMP_LIBRARY}")
+  ENDIF(NOT ASSIMP_FIND_QUIETLY)
+ELSE(ASSIMP_FOUND)
+  IF(ASSIMP_FIND_REQUIRED)
+    MESSAGE(FATAL_ERROR "Could not find libASSIMP")
+  ENDIF(ASSIMP_FIND_REQUIRED)
+ENDIF(ASSIMP_FOUND)