documentation modification for AC_F77_WRAPPERS

[Steven G. Johnson]

I noticed that the #ifdef F77_FUNC in the example code didn't make any
sense to me, and complicates the example.  Whether you check this or not
there will be an error in building the program, either at compile-time or
at link-time, and I don't see why the documentation should prefer one over
the other.  (Normally, I would prefer compile-time errors since they come
earlier in the build.)

2001-04-11  Steven G. Johnson  <address@hidden>

        * doc/autoconf.texi (AC_F77_WRAPPERS): Mention C++ as well as C.
        In the example, don't #ifdef F77_FUNC before using it, as that
        would push any errors to link-time rather than compile-time; note
        that the user can test this to invoke alternative behavior.

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