tools: add back lzma-old for ath79

lzma-old host package is required for building ath79 images, as
mksquashfs-lzma is required for generating netgear images.

Fixes commit 4e4ee464 ("ar71xx: drop target")

Signed-off-by: David Bauer <mail@david-bauer.net>

tools/Makefile

@@ -30,7 +30,7 @@ tools-y += mtools dosfstools libressl fakeroot
 tools-$(CONFIG_TARGET_orion_generic) += wrt350nv2-builder upslug2
 tools-$(CONFIG_TARGET_x86) += qemu
 tools-$(CONFIG_TARGET_mxs) += elftosb sdimage
-tools-$(CONFIG_TARGET_ath79) += squashfs
+tools-$(CONFIG_TARGET_ath79) += lzma-old squashfs
 tools-$(CONFIG_USES_MINOR) += kernel2minor
 tools-y += lzma squashfskit4 zip zstd
 tools-$(BUILD_B43_TOOLS) += b43-tools