mesa: add patch to link radv with build-id

Without this, the radv cache uuid would fall back to using the
timestamps of the radv and llvm shared libraries, which are fixed in
/nix/store.  This caused cache collisons, which resulted in crashes
(e.g. #92807).

pkgs/development/libraries/mesa/default.nix

@@ -58,6 +58,7 @@ stdenv.mkDerivation {
     ./missing-includes.patch # dev_t needs sys/stat.h, time_t needs time.h, etc.-- fixes build w/musl
     ./opencl-install-dir.patch
     ./disk_cache-include-dri-driver-path-in-cache-key.patch
+    ./link-radv-with-ld_args_build_id.patch
   ] # do not prefix user provided dri-drivers-path
     ++ lib.optional (lib.versionOlder version "19.0.0") (fetchpatch {
       url = "https://gitlab.freedesktop.org/mesa/mesa/commit/f6556ec7d126b31da37c08d7cb657250505e01a0.patch";

pkgs/development/libraries/mesa/link-radv-with-ld_args_build_id.patch

@@ -0,0 +1,26 @@
+From 00f3c6d1b771c11ecc08c3d8bd793a51d6e64166 Mon Sep 17 00:00:00 2001
+From: David McFarland <corngood@gmail.com>
+Date: Sun, 26 Jul 2020 17:29:49 -0300
+Subject: [PATCH] link radv with ld_args_build_id
+
+This is needed for radv_device_get_cache_uuid to work correctly.
+---
+ src/amd/vulkan/meson.build | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/amd/vulkan/meson.build b/src/amd/vulkan/meson.build
+index efcf2dd6c89..590f286b8cb 100644
+--- a/src/amd/vulkan/meson.build
++++ b/src/amd/vulkan/meson.build
+@@ -173,7 +173,7 @@ libvulkan_radeon = shared_library(
+   ],
+   c_args : [c_vis_args, no_override_init_args, radv_flags],
+   cpp_args : [cpp_vis_args, radv_flags],
+-  link_args : [ld_args_bsymbolic, ld_args_gc_sections],
++  link_args : [ld_args_build_id, ld_args_bsymbolic, ld_args_gc_sections],
+   install : true,
+ )
+ 
+-- 
+2.27.0
+