limit mkdwarfs workers to 1

scripts/makeappimage_64-bit.sh

@@ -57,6 +57,7 @@ echo "Generating AppImage..."
 	--set-owner 0 --set-group 0 \
 	--no-history --no-create-timestamp \
 	--compression zstd:level=22 -S25 -B8 \
+	--num-workers=1 \
 	--header uruntime \
 	-i ./AppDir -o PPSSPP-"$VERSION"-anylinux-"$ARCH".AppImage