Add automatic detection for Linux on SuperH

PR: 1152
Submitted by: Mike Frysinger <vapier@gentoo.org>

config

@@ -593,6 +593,8 @@ case "$GUESSOS" in
 	OUT="linux-generic32" ;;
   arm*b-*-linux2) OUT="linux-generic32"; options="$options -DB_ENDIAN" ;;
   arm*l-*-linux2) OUT="linux-generic32"; options="$options -DL_ENDIAN" ;;
+  sh*b-*-linux2) OUT="linux-generic32"; options="$options -DB_ENDIAN" ;;
+  sh*-*-linux2)  OUT="linux-generic32"; options="$options -DL_ENDIAN" ;;
   m68k*-*-linux2) OUT="linux-generic32"; options="$options -DB_ENDIAN" ;;
   s390*-*-linux2) OUT="linux-generic32"; options="$options -DB_ENDIAN -DNO_ASM" ;;
   x86_64-*-linux?) OUT="linux-x86_64" ;;