[gnome-control-center/gnome-3-30] thunderbolt: Fix compile-time warning

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit e7c90e1bff7b3535c8e96195b66dfce512b4262e
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Nov 21 13:16:47 2018 +0000

    thunderbolt: Fix compile-time warning
    
    The Thunderbolt panel warns about explicit_bzero() not being available
    but never checked for it.
    
    gnome-control-center/panels/thunderbolt/bolt-str.c: In function ‘bolt_erase_n’:
    gnome-control-center/panels/thunderbolt/bolt-str.c:33:4: warning: #warning no explicit bzero, using 
fallback [-Wcpp]
       #warning no explicit bzero, using fallback
        ^~~~~~~
    
    Closes: #286
    
    
    (cherry picked from commit cad5f982c9bd9c8e4c31398c59faa595edc9d8ee)

 meson.build | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/meson.build b/meson.build
index a826a492a..d6f11783c 100644
--- a/meson.build
+++ b/meson.build
@@ -181,6 +181,11 @@ endif
 config_h.set('HAVE_WAYLAND', enable_wayland,
              description: 'Define to 1 if Wayland is enabled')
 
+# thunderbolt
+config_h.set10('HAVE_FN_EXPLICIT_BZERO',
+               cc.has_function('explicit_bzero', prefix: '''#include <string.h>'''),
+               description: 'Define if explicit_bzero is available')
+
 if host_is_linux
   # network manager
   network_manager_deps = [