[gtkada] Security patch: Format string vulnerability

[Björn Persson]

The GCC option -Werror=format-security found a format string
vulnerability in Glib.Messages.Log. The log message is passed to g_log
as if it were a format string.

If some code that uses Glib.Messages.Log can be tricked into logging a
string containing percent characters, then this bug can make it
vulnerable to various attacks, possibly including remote code execution.

This patch adds a correct format string.

Björn Persson
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