more readability improvments to `examples/unit-tests/Makefile`.
more readability improvments to `examples/unit-tests/Makefile`.

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