Fix vtest build by depending on libvirglrenderer_dep

Build was broken by https://gitlab.freedesktop.org/virgl/virglrenderer/merge_requests/335

Reviewed-by: Gert Wollny <gert.wollny@collabora.com>

vtest/meson.build

@@ -55,6 +55,6 @@ if with_fuzzer
       c_args : [ '-fsanitize=address', '-fsanitize=fuzzer' ],
       link_args : [ '-fsanitize=address', '-fsanitize=fuzzer' ],
       objects : vtest_obj,
-      dependencies : libvirgl_dep
+      dependencies : libvirglrenderer_dep
    )
 endif