Add NO_RETURN specifiers to functions in lib-src.

Add NO_RETURN specifiers to functions in lib-src.
* lib-src/update-game-score.c (usage):  Add NO_RETURN specifier.
* lib-src/movemail.c (fatal, pfatal_with_name, pfatal_and_delete):
* lib-src/make-docfile.c (fatal):
* lib-src/hexl.c (usage):
* lib-src/fakemail.c (fatal):
* lib-src/etags.c (fatal, suggest_asking_for_help, pfatal):
* lib-src/emacsclient.c (fatal):
* lib-src/b2m.c (fatal): Likewise.