meson: Do not require shader cache for radv.

We fixed the compile error a while ago.

Fixes: cc10b34e9e "util/disk_cache: Fix disk_cache_get_function_timestamp with disabled cache."
Reviewed-by: Drew Davenport <ddavenport@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5649>

meson.build

@@ -909,9 +909,6 @@ if _shader_cache != 'disabled'
     with_shader_cache = true
   endif
 endif
-if with_amd_vk and not with_shader_cache
-  error('Radv requires shader cache support')
-endif
 
 # Check for GCC style builtins
 foreach b : ['bswap32', 'bswap64', 'clz', 'clzll', 'ctz', 'expect', 'ffs',