[Bug 281521] security/libretls: fix build with clang 19

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281521

            Bug ID: 281521
           Summary: security/libretls: fix build with clang 19
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: bapt@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(bapt@FreeBSD.org)
          Assignee: bapt@FreeBSD.org

Clang 19 has become more strict about function redefinitions, which
results in:

  compat/arc4random.c:197:1: error: redefinition of 'arc4random_buf'
    197 | arc4random_buf(void *buf, size_t n)
        | ^
  /usr/include/ssp/stdlib.h:38:22: note: previous definition is here
     38 | __ssp_redirect(void, arc4random_buf, (void *__buf, size_t __len),
        |                      ^

The problem is that the configure script "detects" arc4random_buf just
fine, due to the ports system passing ac_cv_func_arc4random_buf=yes, but
it also has an overriding part:

  # fork detection missing, weak seed on failure
  #
https://svnweb.freebsd.org/base/head/lib/libc/gen/arc4random.c?revision=268642&view=markup
  USE_BUILTIN_ARC4RANDOM=yes

I think both of these are no longer true, so delete these lines in
post-patch, which ensures that compat/arc4random.c is _not_ compiled at
all.

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