fix sigemptyset and sigfillset for mips

they were leaving junk in the upper bits.

src/signal/sigemptyset.c

@@ -4,6 +4,10 @@
 int sigemptyset(sigset_t *set)
 {
 	set->__bits[0] = 0;
-	if (sizeof(long)==4) set->__bits[1] = 0;
+	if (sizeof(long)==4 || _NSIG > 65) set->__bits[1] = 0;
+	if (sizeof(long)==4 && _NSIG > 65) {
+		set->__bits[2] = 0;
+		set->__bits[3] = 0;
+	}
 	return 0;
 }

src/signal/sigfillset.c

@@ -7,8 +7,13 @@ int sigfillset(sigset_t *set)
 #if ULONG_MAX == 0xffffffff
 	set->__bits[0] = 0x7ffffffful;
 	set->__bits[1] = 0xfffffffcul;
+	if (_NSIG > 65) {
+		set->__bits[2] = 0xfffffffful;
+		set->__bits[3] = 0xfffffffful;
+	}
 #else
 	set->__bits[0] = 0xfffffffc7ffffffful;
+	if (_NSIG > 65) set->__bits[1] = 0xfffffffffffffffful;
 #endif
 	return 0;
 }