tests: conditionalize use of SIGPIPE

SIGPIPE is not available on the Windows platform.

Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

tests/virlockspacetest.c

@@ -342,7 +342,9 @@ mymain(void)
 {
     int ret = 0;
 
+#ifndef WIN32
     signal(SIGPIPE, SIG_IGN);
+#endif /* WIN32 */
 
     if (virTestRun("Lockspace creation", testLockSpaceCreate, NULL) < 0)
         ret = -1;