builddeb: Add automatic support for ppc64 and powerpcspe architectures

We currently label 64-bit big-endian kernel packages as
powerpc (32-bit), mostly because it was officially supported while
ppc64 (64-bit big-endian) was not.  Now neither is officially
supported, so label these packages as ppc64.

Debian also has a powerpcspe (32-bit with SPE) architecture.
Label packages with a suitable configuration as powerpcspe.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

scripts/package/mkdebian

@@ -35,7 +35,12 @@ set_debarch() {
 	s390*)
 		debarch=s390x ;;
 	ppc*)
-		debarch=$(if_enabled_echo CPU_LITTLE_ENDIAN ppc64el powerpc) ;;
+		if is_enabled 64BIT; then
+			debarch=ppc64$(if_enabled_echo CPU_LITTLE_ENDIAN el)
+		else
+			debarch=powerpc$(if_enabled_echo SPE spe)
+		fi
+		;;
 	parisc*)
 		debarch=hppa ;;
 	mips*)