kconfig: gconf: show GTK version in About dialog
Likewise xconfig, it is useful to display the GTK version in the About
dialog.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>