[gtk] (18 commits) Non-fast-forward update to branch lrn/gtk4warnings

[LRN <ruslanizhb src gnome org>]

The branch 'lrn/gtk4warnings' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  27f6cf5... Fix wrong format strings in various places
  c445570... Remove unused variables (mostly in W32 code)
  224ab99... Fix gdk_win32_cairo_context_end_frame prototype
  2fe3c5d... Fix various type mismatch warnings
  7b1d05b... Remove some more unused variables
  f729450... Fix signedness issues, remove unused code
  64fa58a... Remove unused functions in W32 backend
  16be427... Fix a missing default case warning
  324d32f... A quick and dirty fix for a circular allocation issue
  0fd90cf... Fix more signedness issues in W32 backend
  369703e... Remove unused code in gdksurface-win32.c
  419b00e... Fix a warning about uninitialized variable
  6f488cc... Fix a typo in W32 event-handling code
  f01f211... Fix some warnings in W32 part of gtkmain
  bc3d88e... Fix missing default switch cases in gtkimcontextsimple
  0f74bb2... Fix missing default switch case in DllMain
  94f1d9c... See if _MSC_VER is defined before checking its value
  46a841c... Use correct stat struct for ftw()

Commits added to the branch:

  10b2f65... Fix wrong format strings in various places
  58fc122... Remove unused variables (mostly in W32 code)
  aaa4e23... Fix gdk_win32_cairo_context_end_frame prototype
  bc47fa2... Fix various type mismatch warnings
  0e1710a... Remove some more unused variables
  8bd6936... Fix signedness issues, remove unused code
  f0103ee... Remove unused functions in W32 backend
  1e2ab40... Fix a missing default case warning
  cacdef8... A quick and dirty fix for a circular allocation issue
  3acd26c... Fix more signedness issues in W32 backend
  93f8f3c... Remove unused code in gdksurface-win32.c
  e73dc5c... Fix a warning about uninitialized variable
  cddc9ff... Fix a typo in W32 event-handling code
  411c535... Fix some warnings in W32 part of gtkmain
  43d6fe2... Fix missing default switch cases in gtkimcontextsimple
  9330be8... Fix missing default switch case in DllMain
  0365dad... See if _MSC_VER is defined before checking its value
  43f3789... Use correct stat struct for ftw()