sharutils-4.15.2 fails to build with GCC 15

<[email protected]> Wed, 5 Mar 2025 10:56:24 +0100
Newsgroups gmane.comp.gnu.utils.bugs
Message-ID <[email protected]>
GCC 15 defaults to ISO C23 which changed a meaning of an empty argument list
in function protypes (int foo();). As a result sharutils-4.15.2 fails to
build. The following set of three patches resolves it.

-- Petr