[Bug 283132] security/heimdal-devel: fix with stock clang and lld >= 16

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283132

            Bug ID: 283132
           Summary: security/heimdal-devel: fix with stock clang and lld
                    >= 16
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: cy@FreeBSD.org
          Reporter: dim@FreeBSD.org
          Assignee: cy@FreeBSD.org
             Flags: maintainer-feedback?(cy@FreeBSD.org)

Upstream clang >= 16 made -Wimplicit-function-declaration into an error
by default. In the base system, this change was reverted to reduce the
fallout in ports, because there are many problematic configure scripts.

For security/heimdal-devel this also applies, so for building the port
with devel/llvm16 or higher we need to add
-Wno-implicit-function-declaration to CFLAGS.

Additionally, similar to bug 275979, add -Wl,--undefined-version to
LDFLAGS, to suppress any linker errors about missing versioned symbols.

Note: these changes are mainly needed for bug 283013, which attempts to bump
the default LLVM_VERSION to 18.

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