[gnome-commander] src/gnome-cmd-user-actions.cc: fix for -Wimplicit-fallthrough

[Uwe Scholz <uwescholz src gnome org>]

commit 4337d73df9ae517ae8770324fcb246531b3ad5ab
Author: Mamoru TASAKA <mtasaka fedoraproject org>
Date:   Tue Apr 25 12:47:19 2017 +0900

    src/gnome-cmd-user-actions.cc: fix for -Wimplicit-fallthrough
    
    src/gnome-cmd-user-actions.cc:2271:10: error: this statement may fall through 
[-Werror=implicit-fallthrough=]
       cmdlen = cmd->length();

 src/gnome-cmd-user-actions.cc |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/gnome-cmd-user-actions.cc b/src/gnome-cmd-user-actions.cc
index 3c97185..c65ddd8 100644
--- a/src/gnome-cmd-user-actions.cc
+++ b/src/gnome-cmd-user-actions.cc
@@ -2269,6 +2269,10 @@ int parse_command(string *cmd, gchar *command)
                }
                 *cmd += '%';
                cmdlen = cmd->length();
+#if defined (__GNUC__) && __GNUC__ >= 7
+               __attribute__ ((fallthrough));
+#endif
+
             case '%':           // %%  percent sign
                if (cmdcap < cmdlen + 1)
                {