[gtk] (18 commits) ...Merge branch 'ebassi/for-master' into 'master'

[Emmanuele Bassi <ebassi src gnome org>]

Summary of changes:

  a5986f0... build: Use get_supported_link_arguments() (*)
  6181867... build: Remove unused backend_immodules variable (*)
  11bca98... build: Remove unused variable (*)
  7975bbf... build: Remove linker flags from static libraries (*)
  e75e44b... build: Remove duplicate definition (*)
  99e0929... build: Use a consistent style for Meson files (*)
  474b4ac... build: Use Meson support for dylib versions (*)
  bdbea0d... docs: Add more ignored header for GSK (*)
  f546e03... docs: Add missing symbols to the GSK reference (*)
  538aa6c... Move private GdkX11 symbols out of a public header (*)
  ff35172... docs: Add missing symbols to the GDK reference (*)
  a6bd0c7... Remove stray mentions of GdkConfigureEvent (*)
  91bba79... docs: Add missing symbols to the GTK reference (*)
  3132b10... docs: Add more private headers (*)
  69b181f... Remove boxed type for GtkCrossingData (*)
  ea5e186... Hide GtkTextAttributes functions (*)
  5d2278a... docs: Add public symbols to the GTK reference (*)
  6039a36... Merge branch 'ebassi/for-master' into 'master'

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