Fix for Linux exec bit
Fix for Linux exec bit

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