Fixed compiling error.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@411 bbd45198-f89e-11dd-88c7-29a3b14d5316

rtgui/SConscript

@@ -8,8 +8,6 @@ common/rtgui_system.c
 common/rtgui_theme.c
 common/asc12font.c
 common/asc16font.c
-common/arial12font.c
-common/arial16font.c
 common/color.c
 common/dc.c
 common/dc_buffer.c