Get rid of the rest of variables exported from libgtk
Especially the gtk_*_type ones in gtktexttypes.h were mentioned in gtk.symbols presumably by accident. That header isn't even installed, so no way can they be supposed to be public. gtk_text_attr_appearance_type is from the installed but "semi-private" gtktextlayout.h, so drop that one too from gtk.symbols for now. The use of gtk_text_unknown_char_utf8 is bit of a mess. Code in a few files knew implicitly that it is three bytes. Define a symbolic name for the length of it instead. Add an exported function gtk_text_unknown_char_utf8_gtk_tests_only() that returns a pointer to it just for the sake of gtk/tests/textbuffer.c. Prefix the variable with an underscore. I doubt the usefulness of the test_utf8() in textbuffer.c. If it could be dropped, gtk_text_unknown_char_utf8_gtk_tests_only() could be dropped, too.
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