[gimp] (12 commits) Non-fast-forward update to branch wip/Jehan/incremental-win-installer-improvements

[Jehan <jehanp src gnome org>]

The branch 'wip/Jehan/incremental-win-installer-improvements' 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:

  5861ee8... build: separate debug symbols from binaries in the Windows 
  1c018aa... build: create installer with debug symbols and Python suppo
  9efe8a1... build: add a test to check the Windows installer languages.
  572d716... meson: -Dwindows-installer also works on Windows.
  7b32aa4... build: job win-installer-nightly should return failure appr
  7e2522e... build: extensions are gimp32/64 specific.
  f1a861d... build: fix Python support in Windows installer.
  c0dc10c... Test: install lua51 and lua51-lgi.
  8869112... Add GObject Introspection libs.

Commits added to the branch:

  c5b05b6... build: separate debug symbols from binaries in the Windows  (*)
  9d065b8... build: create installer with debug symbols and Python suppo (*)
  8a42c6c... build: add a test to check the Windows installer languages. (*)
  a8f020d... meson: -Dwindows-installer also works on Linux build machin (*)
  f647517... build: job win-installer-nightly should return failure appr (*)
  9c62dfd... build: extensions are gimp32/64 specific. (*)
  7d9e6e3... build: fix Python support in Windows installer. (*)
  ee2a310... meson: fix the build. (*)
  3b3ab0a... plug-ins: fix #6116 grayscale gif animation hangs on export (*)
  b815bca... gitlab-ci, build: --enable-windows-installer also on Linux. (*)
  a8e1f21... Debug.
  cc95c21... Test: install lua51 and lua51-lgi.

(*) This commit already existed in another branch; no separate mail sent