Emacs Git make bootstrap failure - idna related

[CHENG Gao]

make bootstrap error:

,----
| Eager macro-expansion failure: (void-variable idna-program)
| 
| In toplevel form:
| gnus/deuglify.el:221:1:Error: Symbol’s value as variable is void: idna-program
| make[3]: *** [gnus/deuglify.elc] Error 1
| make[2]: *** [compile-main] Error 2
| make[1]: *** [lisp] Error 2
| make: *** [bootstrap] Error 2
`----

I know Lars the BugSweeper is overhauling things. So this mainly serves
as FYI only.