[package] hotplug2: Make missing include files non fatal

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25414 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/hotplug2/patches/170-non_fatal_include.patch

+--- a/parser/parser.c
++++ b/parser/parser.c
+@@ -578,7 +578,7 @@ int parser_file(const char *filename, st
+ 	ctx.lexer.fp = fopen(filename, "r");
+ 	if (ctx.lexer.fp == NULL) {
+ 		parser_clear(&ctx);
+-		return -1;
++		return 0;
+ 	}
+ 	ctx.lexer.filename = strdup(filename);
+