gnu: mesa: Update to 21.2.4.

* gnu/packages/patches/mesa-skip-tests.patch: Adjust for current version.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

gnu/packages/patches/mesa-skip-tests.patch

@@ -5,25 +5,15 @@ completely with this patch:
 https://gitlab.freedesktop.org/mesa/mesa/-/issues/4091
 
 diff --git a/src/util/meson.build b/src/util/meson.build
-index 0893f64..909b3e0 100644
+index 319b22d9bf7..93790c72675 100644
 --- a/src/util/meson.build
 +++ b/src/util/meson.build
-@@ -289,18 +289,6 @@ if with_tests
-      suite : ['util'],
-   )   
+@@ -344,7 +344,7 @@ if with_tests
+     )
+   endif
  
--  test(
--    'u_debug_stack',
--    executable(
--      'u_debug_stack_test',
--      files('u_debug_stack_test.cpp'),
--      include_directories : [inc_include, inc_src, inc_mapi, inc_mesa, inc_gallium, inc_gallium_aux],
--      dependencies : [idep_mesautil, idep_gtest],
--      c_args : [c_msvc_compat_args],
--    ),
--     suite : ['util'],
--  )
--
-   process_test_exe = executable(
-     'process_test',
-     files('process_test.c'),
+-  foreach t: ['bitset', 'register_allocate', 'u_debug_stack', 'u_qsort']
++  foreach t: ['bitset', 'register_allocate', 'u_qsort']
+     test(
+       t,
+       executable(