crossgcc: Add mipsel-elf as supported target

Change-Id: Icd8050d9193f9957468cfa13901ec14e993e50de
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/8630
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
diff --git a/util/crossgcc/buildgcc b/util/crossgcc/buildgcc
index 0779266..fc85734 100755
--- a/util/crossgcc/buildgcc
+++ b/util/crossgcc/buildgcc
@@ -229,6 +229,7 @@
 case "$TARGETARCH" in
 	i386-elf)	;;
 	i386-mingw32)	;;
+	mipsel-elf)	;;
 	i386*)		TARGETARCH=i386-elf;;
 	arm*)		TARGETARCH=armv7-a-eabi;;
 	aarch64*)	TARGETARCH=aarch64-elf;;