[PATCH v2] testsuite/C++: cope with IPv6 being unavailable

[Jan Beulich via Gcc-patches]

When IPv6 is disabled in the kernel, the error message coming back from
Cody::OpenInet6() is different from the sole so far expected one.
---
v2: Re-base.

--- a/gcc/testsuite/g++.dg/modules/bad-mapper-3.C
+++ b/gcc/testsuite/g++.dg/modules/bad-mapper-3.C
@@ -1,6 +1,6 @@
 //  { dg-additional-options "-fmodules-ts -fmodule-mapper=localhost:172477262" 
}
 import unique3.bob;
-// { dg-error {failed (connecting|disabled) mapper 'localhost:172477262'} "" { 
target *-*-* } 0 }
+// { dg-error {failed (socket|connecting|disabled) mapper 
'localhost:172477262'} "" { target *-*-* } 0 }
 // { dg-prune-output "fatal error:" }
 // { dg-prune-output "failed to read" }
 // { dg-prune-output "compilation terminated" }