re: AC_C_CONST fails with -Werror

[Dan Kegel]

Reviving
https://lists.gnu.org/archive/html/bug-autoconf/2008-11/msg00007.html
https://lists.gnu.org/archive/html/bug-autoconf/2008-11/msg00008.html

There is an argument for fixing AC_C_CONST: the way it breaks
caused strange errors building one package because its config.h
defined const to /**/.   Users shouldn't have to go digging around
to figure stuff like that out.  (Well, ok, any user who does
./configure CFLAGS="-Werror -Wall" is asking for it, and shouldn't
mind digging around, but still.)

Here's a patch that seems to do the trick, only very lightly tested.

c_const.patch
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