add PIPE_SUBSYSTEM_EMBEDDED when embedded platform used
diff --git a/scons/gallium.py b/scons/gallium.py
index 467b67f..0385620 100644
--- a/scons/gallium.py
+++ b/scons/gallium.py
@@ -229,6 +229,8 @@
     if platform == 'wince':
         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_CE']
         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_CE_OGL']
+    if platform == 'embedded':
+        cppdefines += ['PIPE_SUBSYSTEM_EMBEDDED']
     env.Append(CPPDEFINES = cppdefines)
 
     # C compiler options