configure: AC_C_CONST is obsolete

[Dan Kegel]

AC_C_CONST is known to be broken under -Wall -Werror, which
means wine's config.h defines const away; hilarity ensues.

The autoconf maintainers do not plan to fix it; they say "... just
drop AC_C_CONST: unless you know of a system with a compiler that
doesn't support const, chances are you won't ever meet one.  These are
all just museum systems, and maybe a couple of long-running servers
(which is why AC_C_CONST hasn't been eliminated yet IIRC)."

So let's drop it.
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