Added borland-5_6_4 to list of required platforms.

[SVN r34190]

status/explicit-failures-markup.xml

@@ -20,6 +20,7 @@
     -->
 
     <!-- /////////////// Toolsets /////////////// -->
+    <mark-toolset name="borland-5_6_4" status="required"/>
     <mark-toolset name="borland-5_8_2" status="required"/>
     <mark-toolset name="cw-9.4" status="required"/>
     <mark-toolset name="vc-6_5" status="required"/>