fix module install (NOAA-GFDL#27)

Author: travissluka

CMakeLists.txt

@@ -308,7 +308,7 @@ set_target_properties(${PROJECT_NAME} PROPERTIES Fortran_MODULE_DIRECTORY ${CMAK
 install(DIRECTORY ${CMAKE_BINARY_DIR}/${MODULE_DIR}/ DESTINATION ${CMAKE_INSTALL_LIBDIR}/${MODULE_DIR})
 target_include_directories(${PROJECT_NAME} INTERFACE
                             $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/${MODULE_DIR}>
-                            $<INSTALL_INTERFACE:${MODULE_DIR}>)
+                            $<INSTALL_INTERFACE:${CMAKE_INSTALL_LIBDIR}/${MODULE_DIR}>)
 
 # Private .inc include locations
 target_include_directories( fms PRIVATE