fixed bug in `--auto_deps` where `build-config` options field was not being properly preserved when processing transitive dependencies.
fixed bug in `--auto_deps` where `build-config` options field was not being properly preserved when processing transitive dependencies.

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