network/utils/owipcalc: drop Build/Prepare rule in favor of default one

Signed-off-by: Alexandru Ardelean <[email protected]>

package/network/utils/owipcalc/Makefile

@@ -27,12 +27,6 @@ define Package/owipcalc/description
   for dhcp pools.
 endef
 
-
-define Build/Prepare
-	$(INSTALL_DIR) $(PKG_BUILD_DIR)
-	$(CP) ./src/* $(PKG_BUILD_DIR)/
-endef
-
 define Build/Configure
 endef