Revert OCaml build parallelisation as it was breaking fresh builds
Revert OCaml build parallelisation as it was breaking fresh builds

YaccConstructor/FStar,YaccConstructor/FStar,YaccConstructor/FStar,A-Manning/FStar,A-Manning/FStar,MallabaevAzamat/FStar,FStarLang/FStar,hoheinzollern/FStar,hoheinzollern/FStar,MallabaevAzamat/FStar,hoheinzollern/FStar,FStarLang/FStar,MallabaevAzamat/FStar,YaccConstructor/FStar,MallabaevAzamat/FStar,A-Manning/FStar,FStarLang/FStar,hoheinzollern/FStar