Remove some older compilers from required list

[SVN r40625]

status/explicit-failures-markup.xml

@@ -24,13 +24,6 @@
 
     <!-- /////////////// Toolsets /////////////// -->
     <mark-toolset name="acc" status="required"/>
-    <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="msvc-6.5" status="required"/>
-    <mark-toolset name="msvc-6.5_stlport4" status="required"/>
-    <mark-toolset name="msvc-7.0" status="required"/>
-    <mark-toolset name="msvc-7.1_stlport4" status="required"/>
     <mark-toolset name="msvc-7.1" status="required"/>
     <mark-toolset name="msvc-8.0" status="required"/>
     <mark-toolset name="gcc-mingw-3.4.2" status="required"/>