only run trap error code in the configure template, if the configure script was not found

git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@4715 3c298f89-4303-0410-b956-a3cf2f4a3e73

include/package.mk

@@ -263,7 +263,7 @@ endef
 
 define Build/Configure/Default
 	@(cd $(PKG_BUILD_DIR)/$(3); \
-	[ -x configure ] && \
+	[ -x configure ] && { \
 		$(TARGET_CONFIGURE_OPTS) \
 		CFLAGS="$(TARGET_CFLAGS)" \
 		CPPFLAGS="-I$(STAGING_DIR)/usr/include -I$(STAGING_DIR)/include" \
@@ -287,7 +287,7 @@ define Build/Configure/Default
 		--infodir=/usr/info \
 		$(DISABLE_NLS) \
 		$(1); \
-		true; \
+	} || true; \
 	)
 endef