package/upx: use HOST_CONFIGURE_OPTS

Use HOST_CONFIGURE_OPTS to pass CPPFLAGS and LDFLAGS

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/upx/upx.mk

@@ -15,10 +15,8 @@ HOST_UPX_DEPENDENCIES = host-ucl host-zlib
 # We need to specify all, otherwise the default target only prints a message
 # stating to "please choose a target for 'make'"... :-(
 define HOST_UPX_BUILD_CMDS
-	$(HOST_MAKE_ENV) $(MAKE) CPPFLAGS="$(HOST_CPPFLAGS)" \
-		LDFLAGS="$(HOST_LDFLAGS)" UPX_UCLDIR=$(HOST_DIR) \
-		CXXFLAGS_WERROR= \
-		-C $(@D) all
+	$(HOST_MAKE_ENV) $(HOST_CONFIGURE_OPTS) $(MAKE) \
+		UPX_UCLDIR=$(HOST_DIR) CXXFLAGS_WERROR= -C $(@D) all
 endef
 
 # UPX has no install procedure, so install it manually.