crossgcc/buildgcc: Update for recent arch additions

- Add powerpc64le-linux-gnu & nds32le-elf to the instructions as
supported architectures
- Add nds32le-elf as a supported architecture so it will stop warning
when you build it.

Change-Id: Ifcdbc3d082eae5b9b5f8828914e7d2b7ed1f13a4
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/13961
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/util/crossgcc/buildgcc b/util/crossgcc/buildgcc
index eef71e5..67ff1b6 100755
--- a/util/crossgcc/buildgcc
+++ b/util/crossgcc/buildgcc
@@ -343,7 +343,8 @@
 	printf "                                  (defaults to $TARGETARCH)\n"
 	printf "    [-S|--scripting]              build scripting support for GDB\n\n"
 	printf "Platforms for GCC & GDB:\n"
-	printf "    x86_64 i386-elf i386-mingw32 mipsel-elf riscv-elf arm aarch64\n\n"
+	printf "    x86_64 i386-elf i386-mingw32 mipsel-elf riscv-elf arm aarch64\n"
+	printf "    powerpc64le-linux-gnu nds32le-elf\n\n
 }
 
 printversion() {
@@ -627,6 +628,7 @@
 	i386*)			TARGETARCH=i386-elf;;
 	arm*)			TARGETARCH=arm-eabi;;
 	aarch64*)		TARGETARCH=aarch64-elf;;
+	nds32le-elf)		;;
 	*)			printf "${red}WARNING: Unsupported architecture $TARGETARCH.${NC}\n\n"; ;;
 esac