bin/symbols-check.py: add --ignore-symbol argument

This will be used by radv to ignore 'the ac_init_llvm_once' symbol,
which is not part of vulkan-icd-symbols.txt but is required to be
exported to improve interop with radeonsi/vaapi.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Acked-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5648>
1 file changed