Mark up units vacpp failure

[SVN r49999]

status/explicit-failures-markup.xml

@@ -5660,6 +5660,15 @@ With aC++, the tests compile cleanly in strict ansi mode and succeed.
         </mark-expected-failures>
     </library>
 
+    <!-- units -->
+    <library name="units">
+        <mark-expected-failures>
+            <test name="fail_base_dimension"/>
+            <toolset name="vacpp"/>
+            <note author="Steven Watanabe" refid="16"/>
+        </mark-expected-failures>
+    </library>
+
     <!-- unordered -->
     <library name="unordered">
       <mark-expected-failures>