[gnome-builder] (10 commits) ...Merge branch 'wip/tintou/toolchain'

[Christian Hergert <chergert src gnome org>]

Summary of changes:

  2c34115... sysroot: use IdeTriplet to handle the architecture triplet (*)
  bf72f25... toolchain: add the IdeToolchain object (*)
  a8bde4a... cmake: provide toolchains from the source directory (*)
  710b358... meson: provide toolchains from the source directory and sys (*)
  362b2cb... autotools: use the tools provided by the selected toolchain (*)
  107d2a7... sysroot: provide toolchains from sysroot directory (*)
  7e3d2b0... gcc: provide cross-architecture toolchains from the system (*)
  c8cb8f5... gcc: cleanup gcc toolchain
  3d75537... toolchain: a few small cleanups
  04cdb7f... Merge branch 'wip/tintou/toolchain'

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