[COMMIT] Support #!, to allow XEmacs to be called as a script interpreter.

[Aidan Kehoe]

 Ar an chéad lá is fiche de mí Eanair, scríobh Michael Sperber: 

 > Aidan Kehoe <kehoea at parhasard.net> writes:
 > 
 > > (where #!/usr/bin/env xemacs --script doesn’t necessarily work, and where
 > > xemacs-script is a link to the binary), which theirs doesn’t. It also,
 > > unfortunately, fails because I don’t understand autoconf enough to have
 > > @SHEBANG_PROGNAME@ actually expanded; when I do a make-install it creates a
 > > literal /usr/local/bin/@SHEBANG_PROGNAME@ link to the XEmacs binary. Help
 > > appreciated. 
 > 
 > I think you're missing an invocation of AC_SUBST.

Yes, that was it--thank you!

APPROVE COMMIT

NOTE: This patch has been committed. 

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