scope - enable array element size emulation for glib < 2.22, not < 2.20
Unconditionally declare the AM_CONDITIONAL() after all checks are done

Don't call AM_CONDITIONAL() from GP_ARG_ENABLE() or
GP_CHECK_PLUGIN_DEPS() depending on the argument of GP_ARG_ENABLE().
Instead, always call it after every checks are done.
Scope: don't force enabling of the plugin since it has dependencies
GeanyPG: Get rid of long-deprecated gtk_menu_append()

gtk_menu_append() is deprecated in favor of gtk_menu_shell_append()
since GTK 1.3.7, I think it's safe to get rid of it.