Use BatUnix to restore OCaml 4.01 compatibility
Use BatUnix to restore OCaml 4.01 compatibility

aa755/FStar,YaccConstructor/FStar,FStarLang/FStar,msprotz/FStar,MallabaevAzamat/FStar,msprotz/FStar,msprotz/FStar,aa755/FStar,A-Manning/FStar,MallabaevAzamat/FStar,FStarLang/FStar,hoheinzollern/FStar,MallabaevAzamat/FStar,FStarLang/FStar,hoheinzollern/FStar,hoheinzollern/FStar,A-Manning/FStar,YaccConstructor/FStar,msprotz/FStar,YaccConstructor/FStar,hoheinzollern/FStar,aa755/FStar,A-Manning/FStar,YaccConstructor/FStar,MallabaevAzamat/FStar,aa755/FStar