[gimp] (13 commits) ...INSTALL: update with new recommendation of meson for Windows.

[Jehan <jehanp src gnome org>]

Summary of changes:

  354b0c2... build: let's now build the Windows installer with meson. (*)
  b27dd3d... meson: fix broken directx declare_dependency(). (*)
  5703b89... modules: fix one more broken meson rule for directx on Wind (*)
  6ae69f5... build: do not build file-mng for 32-bit Windows. (*)
  fbb484c... build: no need to build the reference API for the Windows b (*)
  c9a34b8... meson: fix libmng test. (*)
  8a6613b... configure: prioritize pkg-config check for libmng. (*)
  e866cb7... configure, libgimp: disable GIR build when cross-compiling  (*)
  1866b4c... configure, tools: colorsvg2png must be built as native buil (*)
  9242cbd... libgimp: fix linking in autotools when cross-compiling. (*)
  1c730ce... meson, plug-ins: further fix the no-pkg-config test for lib (*)
  b83450f... configure, meson: the build tool depends on very old glib. (*)
  588d11d... INSTALL: update with new recommendation of meson for Window (*)

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