[sr #110213] curl fails with autoconf master

[Zack Weinberg]

Update of sr #110213 (project autoconf):

                  Status:                    None => Invalid                
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #2:

Per discussion at
https://lists.gnu.org/archive/html/bug-autoconf/2020-03/msg00011.html this was
because of misuse of AC_REQUIRE in curl's configure script. 
AC_REQUIRE([some_macro]) only makes sense if `some_macro` can be used without
arguments.  There's no good way to detect, from the implementation of
AC_REQUIRE, whether the macro it's been passed can be used without arguments,
so there isn't really anything we can do about it besides add a note to NEWS,
which I have done.

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