Fixed xts test-malloc-info libxml2 dependency

Signed-off-by: NMaxim Polyakov <polyakov.maksim@huawei.com>

libc-test/test_template.gni

@@ -132,9 +132,7 @@ template("test_unittest") {
       }
 
       if (target_name == "test-malloc-info") {
-        include_dirs += [ "//third_party/libxml2/include" ]
-        lib_dirs = [ "//${root_out_dir}/thirdparty/libxml2" ]
-        libs += [ "xml2.z" ]
+        deps = [ "//third_party/libxml2:xml2" ]
       }
     }