[Bug 268277] textproc/scdoc: fix build with clang 15

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 09 Dec 2022 15:24:45 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268277

            Bug ID: 268277
           Summary: textproc/scdoc: fix build with clang 15
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: jbeich@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(jbeich@FreeBSD.org)
          Assignee: jbeich@FreeBSD.org

During an exp-run for llvm 15 (see bug 265425), it turned out that
textproc/scdoc failed to build with clang 15:

  In file included from src/main.c:12:
  include/str.h:10:23: error: a function declaration without a prototype is
deprecated in all versions of C [-Werror,-Wstrict-prototypes]
  struct str *str_create();
                        ^
                         void
  1 error generated.

This is because -Wstrict-prototypes now requires functions taking no parameters
to be declared with "(void)".

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