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GContentType, GAppInfo, GSpawn, GThread introspection annotations missing on Windows

Edit: See https://github.com/msys2/MINGW-packages/issues/21227#issuecomment-2205915457 for a writeup of the issue. tl;dr: bisection points to !3636 (merged); this is essentially the same issue as !4106 (merged) but for g_content_type_guess()

Since one of the last versions we have a problem with multiple of the Gio.content* methods on Windows.

It started with one of them not available to the python bindings, which got fixed in !4106 (merged)

Now we receive the error

Gio.content_type_guess() takes exactly 4 arguments (2 given)

although the python binding docs only specify 2 arguments. See https://lazka.github.io/pgi-docs/#Gio-2.0/functions.html#Gio.content_type_guess

I scanned the changelog and found no mention of a breaking change for this method.

See the analysis and the approach to the fix.

Files needing to be fixed:

Edited by Philip Withnall