Generalized use of external modules

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

CMakeLists.txt

@@ -330,8 +330,10 @@ execute_process(COMMAND cmake -E make_directory ${ep_base}/Install/include)
 #
 set(module_libraries)
 foreach(module ${config_module_list})
-	if(module MATCHES "Eagle")
-		add_subdirectory(${module} ${CMAKE_BINARY_DIR}/${module})
+	string(REGEX MATCH "^[./]" external_module ${module})
+	if(external_module)
+		get_filename_component(EXT_MODULE ${module} NAME)
+		add_subdirectory(${module} ${CMAKE_BINARY_DIR}/external_mod/${EXT_MODULE})
 	else() 
 		add_subdirectory(src/${module})
 	endif()