[new release] dune (1.7.2)
[new release] dune (1.7.2)

CHANGES:

- Add `${corrected-suffix}`, `${library-name}` and a few other
  variables to the list of variables to upgrade. This fixes the
  support for various framework producing corrections (ocaml/dune#1840, ocaml/dune#1853,
  @diml)

- Fix `$ dune subst` failing because the build directory wasn't set. (ocaml/dune#1854, fix
  ocaml/dune#1846, @rgrinberg)

- Configurator: Add warning to `Pkg_config.query` when a full package expression
  is used. Add `Pkg_config.query_expr` for cases when the full power of
  pkg-config's querying is needed (ocaml/dune#1842, fix ocaml/dune#1833, @rgrinberg)

- Fix unavailable, optional implementations eagerly breaking the build (ocaml/dune#1857,
  fix ocaml/dune#1856, @rgrinberg)

orbitz/opam-repository,camlspotter/opam-repository,jonludlam/opam-repository,AltGr/opam-repository,emillon/opam-repository,ocaml/opam-repository,camlspotter/opam-repository,jonludlam/opam-repository,Leonidas-from-XIV/opam-repository,dra27/opam-repository,lefessan/opam-repository,andersfugmann/opam-repository,planar/opam-repository,jhwoodyatt/opam-repository,pqwy/opam-repository,codinuum/opam-repository,ocaml/opam-repository,hannesm/opam-repository,emillon/opam-repository,mjambon/opam-repository,gasche/opam-repository,yallop/opam-repository,nberth/opam-repository,c-cube/opam-repository,toots/opam-repository,dbuenzli/opam-repository,avsm/opam-repository,Chris00/opam-repository,fpottier/opam-repository,codinuum/opam-repository,dbuenzli/opam-repository,AltGr/opam-repository,fpottier/opam-repository,dra27/opam-repository,hannesm/opam-repository,seliopou/opam-repository,djs55/opam-repository,hakuch/opam-repository,c-cube/opam-repository,talex5/opam-repository,Chris00/opam-repository,kkirstein/opam-repository,mjambon/opam-repository,astrada/opam-repository,astrada/opam-repository,nberth/opam-repository,pirbo/opam-repository,jhwoodyatt/opam-repository,Leonidas-from-XIV/opam-repository,seliopou/opam-repository,cakeplus/opam-repository,andersfugmann/opam-repository,abate/opam-repository,djs55/opam-repository,lefessan/opam-repository,toots/opam-repository,talex5/opam-repository,pqwy/opam-repository,pirbo/opam-repository,yallop/opam-repository,avsm/opam-repository,kkirstein/opam-repository,arlencox/opam-repository