GIR file update in commit f0586286 broke pango build

[nirbheek]

Building the commit immediately before this works fine.

error[E0599]: no function or associated item named `uninitialized` found for struct `auto::glyph_string::GlyphString` in the current scope
   --> /home/nirbheek/.cargo/git/checkouts/gtk-rs-core-35cb1a5a363f4187/53497a5/pango/src/auto/functions.rs:252:39
    |
252 |           let mut glyphs = GlyphString::uninitialized();
    |                                         ^^^^^^^^^^^^^ function or associated item not found in `GlyphString`
    |
   ::: /home/nirbheek/.cargo/git/checkouts/gtk-rs-core-35cb1a5a363f4187/53497a5/pango/src/auto/glyph_string.rs:8:1
    |
8   | / glib::wrapper! {
9   | |     #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
10  | |     pub struct GlyphString(Boxed<ffi::PangoGlyphString>);
...   |
17  | | }
    | |_- function or associated item `uninitialized` not found for this struct
    |
note: if you're trying to build a new `auto::glyph_string::GlyphString`, consider using `auto::glyph_string::GlyphString::new` which returns `auto::glyph_string::GlyphString`
   --> /home/nirbheek/.cargo/git/checkouts/gtk-rs-core-35cb1a5a363f4187/53497a5/pango/src/auto/glyph_string.rs:21:5
    |
21  |     pub fn new() -> GlyphString {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: items from traits can only be used if the trait is implemented and in scope
    = note: the following trait defines an item `uninitialized`, perhaps you need to implement it:
            candidate #1: `glib::translate::Uninitialized`

For more information about this error, try `rustc --explain E0599`.
error: could not compile `pango` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...

[sdroege]

See #1693