dhrystone: use the <pkg>_EXTRACT_CMDS mechanism

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/dhrystone/dhrystone.mk

@@ -8,6 +8,11 @@ DHRYSTONE_VERSION = 2
 DHRYSTONE_SOURCE = dhry-c
 DHRYSTONE_SITE = http://www.netlib.org/benchmark/
 
+define DHRYSTONE_EXTRACT_CMDS
+	(cd $(@D) && $(SHELL) $(DL_DIR)/$($(PKG)_SOURCE))
+	$(Q)cp $($(PKG)_DIR_PREFIX)/dhrystone/Makefile $(@D)/
+endef
+
 define DHRYSTONE_BUILD_CMDS
 	$(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D)
 endef
@@ -25,10 +30,3 @@ define DHRYSTONE_UNINSTALL_TARGET_CMDS
 endef
 
 $(eval $(call GENTARGETS))
-
-$(BUILD_DIR)/dhrystone-$(DHRYSTONE_VERSION)/.stamp_extracted:
-	@$(call MESSAGE,"Extracting")
-	$(Q)mkdir -p $(@D)
-	$(Q)cd $(@D) && $(SHELL) $(DL_DIR)/$($(PKG)_SOURCE)
-	$(Q)cp $($(PKG)_DIR_PREFIX)/dhrystone/Makefile $(@D)/
-	$(Q)touch $@