Allow different error message for errno 58

Apparently this is EDEADLOCK on some systems.

Author: nikic

ext/sockets/tests/socket_strerror.phpt

@@ -79,7 +79,7 @@ string(13) "Exchange full"
 string(8) "No anode"
 string(20) "Invalid request code"
 string(12) "Invalid slot"
-string(16) "Unknown error 58"
+string(%d) "%s"
 string(20) "Bad font file format"
 string(19) "Device not a stream"
 string(17) "No data available"