sh: First support code of SuperH.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/Makefile b/Makefile
index ceee2c7..1a9b3d2 100644
--- a/Makefile
+++ b/Makefile
@@ -151,6 +151,9 @@
 ifeq ($(ARCH),avr32)
 CROSS_COMPILE = avr32-linux-
 endif
+ifeq ($(ARCH),sh)
+CROSS_COMPILE = sh4-linux-
+endif
 endif
 endif