testsuite: Make test program compile on Hurd

procps fails to build from source due to usage of field si_int of struct
siginfo_t in lib/test_process.c which does not exist on GNU/Hurd.

Thanks to Svante Signell for the patch.

References:
 https://bugs.debian.org/987557

Signed-off-by: Craig Small <csmall@dropbear.xyz>

lib/test_process.c

@@ -62,7 +62,11 @@ signal_handler(int signum, siginfo_t *siginfo, void *ucontext)
 	    printf("SIG %s\n", signame);
 	    break;
 	case SI_QUEUE:
+#	    ifndef __GNU__
 	        printf("SIG %s value=%d\n", signame, siginfo->si_int);
+#	    else
+	        printf("case SI_QUEUE: SIG %s siginfo->si_int undefined\n", signame);
+#endif
 	    break;
 	default:
 	    printf("Unknown si_code %d\n", siginfo->si_code);