Make .emscripten config file relocatable when using the --embedded flag

I'd like to copy the emsdk directory around freely. This will derive the location of all the tools from the location of the .emscripten file.

emsdk

@@ -724,6 +724,7 @@ def generate_dot_emscripten(active_tools):
   if emscripten_config_directory == emsdk_path():
     temp_dir = sdk_path('tmp')
     mkdir_p(temp_dir)
+    embedded=True
   else:
     temp_dir = tempfile.gettempdir().replace('\\', '/')
 
@@ -731,6 +732,9 @@ def generate_dot_emscripten(active_tools):
   has_node = False
 
   cfg = 'import os\n'
+  
+  if embedded:
+    cfg += 'emsdk_path=os.path.dirname(EM_CONFIG)\n'
 
   for tool in active_tools:
     tool_cfg = tool.activated_config()
@@ -754,6 +758,9 @@ COMPILER_ENGINE = NODE_JS
 JS_ENGINES = [NODE_JS]
 '''
 
+  if embedded:
+    cfg = cfg.replace(emscripten_config_directory, '\' + emsdk_path + \'')
+
   with open(dot_emscripten_path(), "w") as text_file: text_file.write(cfg)
   
   # Clear old cached emscripten content.