panvk: do not export needless symbols

This might be a bit overly careful, but it seems like a good idea to use
both mechanisms to avoid accidental symbol leakage. I also don't think
it matters much in practice, because all sane applications use the the
Vulkan loader, and that shouldn't forward these symbols anyway.

While we're at it, let's wire up a test so we notice if this stops
working.

Acked-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37371>

src/panfrost/vulkan/meson.build

@@ -164,6 +164,7 @@ foreach arch : [6, 7, 10, 12, 13]
       idep_libpan_per_arch[arch.to_string()],
     ],
     c_args : [no_override_init_args, panvk_flags, '-DPAN_ARCH=@0@'.format(arch)],
+    gnu_symbol_visibility : 'hidden',
   )
 endforeach
 
@@ -213,10 +214,24 @@ libvulkan_panfrost = shared_library(
     idep_mesautil,
   ],
   c_args : [no_override_init_args, panvk_flags],
-  link_args : [ld_args_bsymbolic, ld_args_gc_sections, ld_args_build_id],
+  link_args : [vulkan_icd_link_args, ld_args_bsymbolic, ld_args_gc_sections, ld_args_build_id],
+  gnu_symbol_visibility : 'hidden',
   install : true,
 )
 
+if with_symbols_check
+  test(
+    'panvk symbols check',
+    symbols_check,
+    args : [
+      '--lib', libvulkan_panfrost,
+      '--symbols-file', vulkan_icd_symbols,
+      symbols_check_args,
+    ],
+    suite : ['panfrost'],
+  )
+endif
+
 panfrost_icd = custom_target(
   'panfrost_icd',
   input : [vk_icd_gen, vk_api_xml],