Utf8String->CString cleanup.

modules/emscripten/emscripten.monkey2

@@ -11,11 +11,11 @@ Alias em_callback_func:Void()
 Alias em_arg_callback_func:Void(Void Ptr)
 Alias em_str_callback_func:Void(String)
 
-Function emscripten_run_script:Void( script:Utf8String )
-Function emscripten_run_script_int:Int( script:Utf8String )
-Function emscripten_run_script_string:Utf8String( script:Utf8String )
-Function emscripten_async_run_script:Void( script:Utf8String,millis:Int )
-Function emscripten_async_load_script:Void( script:Utf8String,onload:em_callback_func,onerror:em_callback_func )
+Function emscripten_run_script:Void( script:CString )
+Function emscripten_run_script_int:Int( script:CString )
+Function emscripten_run_script_string:CString( script:CString )
+Function emscripten_async_run_script:Void( script:CString,millis:Int )
+Function emscripten_async_load_script:Void( script:CString,onload:em_callback_func,onerror:em_callback_func )
 Function emscripten_set_main_loop:Void( func:em_callback_func,fps:Int,simulate_infinite_loop:Int )
 Function emscripten_set_main_loop_arg:Void( func:em_callback_func,arg:Void Ptr,fps:Int,simulate_infinite_loop:Int )
 Function emscripten_push_main_loop_blocker:Void( func:em_arg_callback_func,arg:Void Ptr )