[gtkada] Patch: Fix unsafe use of g_snprintf.

[Björn Persson]

Fedora is preparing to turn on a GCC option that makes unsafe use of
printf-like functions a compile-time error. Four cases were found in the
GTKada source. I don't know if it can be proven impossible for percent
characters to occur in the strings in these four cases, but copying
strings with a function made for copying strings makes the code more
robust.

Changelog message:
* gtkplotflux.c (gtk_plot_flux_get_legend_size,
gtk_plot_flux_draw_legend): Copy strings with g_strlcpy instead of
passing them as format strings to g_snprintf.

Björn Persson
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