c691149f3e
The mingw compiling error:
```
../../src/mapi/glapi/glapi.h:86:66: error: '_glapi_tls_Dispatch' cannot be thread local when declared 'dllimport'
_GLAPI_EXPORT extern __THREAD_INITIAL_EXEC struct _glapi_table * _glapi_tls_Dispatch;
^
../../src/mapi/glapi/glapi.h:88:51: error: '_glapi_tls_Context' cannot be thread local when declared 'dllimport'
_GLAPI_EXPORT extern __THREAD_INITIAL_EXEC void * _glapi_tls_Context;
```
Fixes: c47fd3dc ("windows: Use TLS context/dispatch with shared-glapi")
Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14062>