pango: export Glyph* manual types

[bilelmoussaoui]

Otherwise gir produces code that uses pango::Glyph* which can't be found

error[E0412]: cannot find type `GlyphInfo` in crate `pango`
  --> gsk4/src/auto/text_node.rs:49:44
   |
49 |       pub fn get_glyphs(&self) -> Vec<pango::GlyphInfo> {
   |                                              ^^^^^^^^^
   | 
  ::: /home/bilelmoussaoui/.cargo/git/checkouts/gtk-rs-48ef14c1f17c79fb/0ef3630/pango/src/auto/glyph_item.rs:8:1
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8  | / glib::glib_wrapper! {
9  | |     #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
10 | |     pub struct GlyphItem(Boxed<ffi::PangoGlyphItem>);
11 | |
...  |
16 | |     }
17 | | }
   | |_- similarly named struct `GlyphItem` defined here
   |
help: a struct with a similar name exists
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49 |     pub fn get_glyphs(&self) -> Vec<pango::GlyphItem> {
   |                                            ^^^^^^^^^
help: consider importing this struct
   |
5  | use pango::glyph::GlyphInfo;
   |