[Bug 274087] devel/libva: fix build with lld 17

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274087

            Bug ID: 274087
           Summary: devel/libva: fix build with lld 17
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: dim@FreeBSD.org

When building libva with lld >= 17, an error similar to the following is
emitted when linking libva.so:

  ld: error: va/libva.so.2.2000.0.p/va_compat.c.o: symbol
  vaCreateSurfaces@VA_API_0.32.0 has undefined version VA_API_0.32.0

The root cause is that lld 17 checks linker version scripts more strictly by
default, and emits an error when undefined symbols or undefined versions are
referenced.

Earlier in the build, it turns out that due to these lld errors, va's
meson.build fails to detect --version-script support:

  Checking if "-Wl,--version-script" : links: NO

This is because the small test program used by meson to check whether a shared
library can be linked with the libva.syms version script is completely empty,
and therefore the two symbols in the version script, vaCreateSurfaces_0_32_0
and vaCreateSurfaces, are undefined.

Fix the problem by providing placeholder definitions for these symbols in the
code argument to meson's cc.links() function. This ensures that meson correctly
detects --version-script support with lld version 17 or later, and makes it
possible to link the libva shared library.

NOTE: also submitted upstream as https://github.com/intel/libva/pull/758

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