Fix #55212. Only declare STREAM_PF_INET6 if PHP is compiled with IPv6 support

Author: dsp

ext/standard/file.c

@@ -236,10 +236,12 @@ PHP_MINIT_FUNCTION(file)
 	REGISTER_LONG_CONSTANT("STREAM_PF_INET", AF_INET, CONST_CS|CONST_PERSISTENT);
 #endif
 
-#ifdef PF_INET6
+#if HAVE_IPV6
+# ifdef PF_INET6
 	REGISTER_LONG_CONSTANT("STREAM_PF_INET6", PF_INET6, CONST_CS|CONST_PERSISTENT);
-#elif defined(AF_INET6)
+# elif defined(AF_INET6)
 	REGISTER_LONG_CONSTANT("STREAM_PF_INET6", AF_INET6, CONST_CS|CONST_PERSISTENT);
+# endif
 #endif
 
 #ifdef PF_UNIX