build: improve reliability of PKG_CONFIG_DEPENDS, remove old .configured_* stamps before creating a new one

SVN-Revision: 28770

include/package.mk

@@ -33,6 +33,7 @@ else
   STAMP_PREPARED=$(PKG_BUILD_DIR)/.prepared$(if $(QUILT)$(DUMP),,_$(shell $(call find_md5,${CURDIR} $(PKG_FILE_DEPENDS),)))
 endif
 STAMP_CONFIGURED:=$(PKG_BUILD_DIR)/.configured$(if $(DUMP),,_$(call confvar,$(PKG_CONFIG_DEPENDS)))
+STAMP_CONFIGURED_WILDCARD=$(patsubst %_$(call confvar,$(PKG_CONFIG_DEPENDS)),%_*,$(STAMP_CONFIGURED))
 STAMP_BUILT:=$(PKG_BUILD_DIR)/.built
 STAMP_INSTALLED:=$(STAGING_DIR)/stamp/.$(PKG_NAME)_installed
 
@@ -131,6 +132,7 @@ define Build/DefaultTargets
 	$(foreach hook,$(Hooks/Configure/Pre),$(call $(hook))$(sep))
 	$(Build/Configure)
 	$(foreach hook,$(Hooks/Configure/Post),$(call $(hook))$(sep))
+	rm -f $(STAMP_CONFIGURED_WILDCARD)
 	touch $$@
 
   $(call Build/Exports,$(STAMP_BUILT))