Fix install folders for cmake - os files.

contrib/irrXML/CMakeLists.txt

@@ -18,5 +18,8 @@ set(IRRXML_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}" CACHE INTERNAL "IrrXML_Incl
 set(IRRXML_LIBRARY "IrrXML" CACHE INTERNAL "IrrXML" )
 
 install(TARGETS IrrXML
+  LIBRARY DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
   ARCHIVE DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
+  RUNTIME DESTINATION ${ASSIMP_BIN_INSTALL_DIR}
+  FRAMEWORK DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
   COMPONENT ${LIBASSIMP_COMPONENT})