[PATCH] Use SIG_BLOCK instead of numeric constant

[info@mobile-stream.com]

gdb on mipsel-alpine-linux-musl* (at least) fails to start without
this change because SIG_BLOCK is 1 not 0 on linux/mips (unlike most
other architectures).

---
 gdb/common/signals-state-save-restore.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/common/signals-state-save-restore.c b/gdb/common/signals-state-save-restore.c
index 5bb66321bb..6597decbc6 100644
--- a/gdb/common/signals-state-save-restore.c
+++ b/gdb/common/signals-state-save-restore.c
@@ -41,7 +41,7 @@ save_original_signals_state (bool quiet)
   int i;
   int res;
 
-  res = sigprocmask (0,  NULL, &original_signal_mask);
+  res = sigprocmask (SIG_BLOCK,  NULL, &original_signal_mask);
   if (res == -1)
     perror_with_name (("sigprocmask"));
 
-- 
2.19.2