builddeb: Add automatic support for mips64el architecture

We currently label 64-bit little-endian kernel packages as
mipsel (32-bit little-endian), mostly it was officially supported
while mips64el (64-bit little-endian) was not.  Now both are
officially supported, so label these packages as mips64el.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/scripts/package/mkdebian b/scripts/package/mkdebian
index 0891974..350724c 100755
--- a/scripts/package/mkdebian
+++ b/scripts/package/mkdebian
@@ -44,7 +44,12 @@
 	parisc*)
 		debarch=hppa ;;
 	mips*)
-		debarch=mips$(if_enabled_echo CPU_LITTLE_ENDIAN el) ;;
+		if is_enabled CPU_LITTLE_ENDIAN; then
+			debarch=mips$(if_enabled_echo 64BIT 64)el
+		else
+			debarch=mips
+		fi
+		;;
 	aarch64|arm64)
 		debarch=arm64 ;;
 	arm*)