include/download.mk: switch to zst compression

The compression is faster to (un)pack files, make use of it.

Also add a new build prerequirement, the `zstd` to (un)pack files.

Signed-off-by: Paul Spooren <[email protected]>
[ improve commit title ]
Signed-off-by: Christian Marangi <[email protected]>

include/download.mk

@@ -13,7 +13,7 @@ ifdef PKG_SOURCE_VERSION
     PKG_VERSION := $(if $(PKG_SOURCE_DATE),$(subst -,.,$(PKG_SOURCE_DATE)),0)~$(call version_abbrev,$(PKG_SOURCE_VERSION))
   endif
   PKG_SOURCE_SUBDIR ?= $(PKG_NAME)-$(PKG_VERSION)
-  PKG_SOURCE ?= $(PKG_SOURCE_SUBDIR).tar.xz
+  PKG_SOURCE ?= $(PKG_SOURCE_SUBDIR).tar.zst
 endif
 
 DOWNLOAD_RDEP=$(STAMP_PREPARED) $(HOST_STAMP_PREPARED)