rpc: conditionalize signal handling

The Windows platform does not have the signal handling
support we need, so it must be disabled in several parts
of the codebase.

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

tools/virt-admin.c

@@ -40,11 +40,6 @@
 #include "vsh-table.h"
 #include "virenum.h"
 
-/* Gnulib doesn't guarantee SA_SIGINFO support.  */
-#ifndef SA_SIGINFO
-# define SA_SIGINFO 0
-#endif
-
 #define VIRT_ADMIN_PROMPT "virt-admin # "
 
 /* we don't need precision to milliseconds in this module */