[telepathy-idle-0.2] telepathy-idle: fix compilation on GCC 9.x, add #pragma

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Module: telepathy-idle
Branch: telepathy-idle-0.2
Commit: 07d021e5e1c11e9ecda0907038bb7a6fa7f18c58
URL:    http://cgit.freedesktop.org/telepathy/telepathy-idle/commit/?id=07d021e5e1c11e9ecda0907038bb7a6fa7f18c58

Author: David Heidelberg <david at ixit.cz>
Date:   Sun Oct 27 17:25:35 2019 +0100

fix compilation on GCC 9.x, add #pragma

Fixes:
In function 'strncpy',
    inlined from 'idle_server_connection_send_async' at idle-server-connection.c:593:2:
/usr/include/bits/string_fortified.h:106:10: error: '__builtin_strncpy' specified bound 512 equals destination size [-Werror=stringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Signed-off-by: David Heidelberg <david at ixit.cz>

---

 src/idle-server-connection.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/idle-server-connection.c b/src/idle-server-connection.c
index 878b199..c463fe0 100644
--- a/src/idle-server-connection.c
+++ b/src/idle-server-connection.c
@@ -590,7 +590,10 @@ void idle_server_connection_send_async(IdleServerConnection *conn, const gchar *
          * with null bytes gives us cleaner debug messages, without
          * affecting the readability of the code.
          */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-truncation"
 	strncpy(priv->output_buffer, cmd, output_buffer_size);
+#pragma GCC diagnostic pop
 
 	priv->nwritten = 0;