2.46.1 (stable):

Build:
* Meson build: Use relative paths to untracked/
  (Kjell Ahlstedt) Merge request gtkmm!61 (Mingli Yu)
* pangommconfig.h.*: Don't dllimport on MinGW
  (Chun-wei Fan) Issue gtkmm#90 (Lukas K.)
* Meson build: Make it possible to use pangomm as a subproject
  (Kjell Ahlstedt)
* Meson build: No implicit_include_directories
  (Kjell Ahlstedt)