package/pkg-luarocks: use <pkg>_EXTRACT_DEPENDENCIES

The host luarocks tool is needed when *extracting* luarocks
packages. Since regular dependencies are only available at the
configure step, it caused the "luarocks" program to be available too
late to be used to extract luarocks packages.

To work around this, host-luarocks was manually added as a dependency
of the extract step of luarocks packages. While this worked fine until
now, it breaks badly with per-package folders, because host-luarocks
is not recorded as an extract dependency of luarocks packages, and
therefore is not copied to the per-package host folder, causing a
failure.

In the mean time, the <pkg>_EXTRACT_DEPENDENCIES mechanism was added,
which aims at fixing exactly this problem, so let's use it and
simplify pkg-luarocks.mk.

Cc: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Acked-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni &lt;<a href="mailto:thomas.petazzoni@bootlin.com" target="_blank">thomas.petazzoni@bootlin.com</a>&gt;<br>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/pkg-luarocks.mk

@@ -42,7 +42,8 @@ $(2)_SITE		?= $$(call qstrip,$$(BR2_LUAROCKS_MIRROR))
 
 # Since we do not support host-luarocks-package, we know this is
 # a target package, and can just add the required dependencies
-$(2)_DEPENDENCIES	+= host-luarocks luainterpreter
+$(2)_DEPENDENCIES	+= luainterpreter
+$(2)_EXTRACT_DEPENDENCIES += host-luarocks
 
 #
 # Extract step. Extract into a temporary dir and move the relevant part to the
@@ -71,10 +72,6 @@ endif
 # make targets
 $(call inner-generic-package,$(1),$(2),$(3),$(4))
 
-# $(2)_DEPENDENCIES are handled for configure step (too late)
-# but host-luarocks is required to do the extract
-$$($(2)_TARGET_EXTRACT): | host-luarocks
-
 endef
 
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