added packages/bst/bst.6.0.0 (#13119)
added packages/bst/bst.6.0.0 (#13119)

* added packages/bst/bst.6.0.0

* unix should be base-unix probably

* bst.6.0.0: add ocaml dependency

We try to have it on all packages using ocaml, as it simplifies adding constraints later. In this case you have an implict constraint on 4.02.3 due to dune

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