util/vl_vlc: Support compiling in C++

Reviewed-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16286>

src/util/vl_vlc.h

@@ -98,7 +98,7 @@ vl_vlc_next_input(struct vl_vlc *vlc)
       vlc->bytes_left = 0;
    }
 
-   vlc->data = vlc->inputs[0];
+   vlc->data = (const uint8_t *) vlc->inputs[0];
    vlc->end = vlc->data + len;
 
    ++vlc->inputs;