Remove some thread markup, per thread maintainters request

[SVN r36806]

status/explicit-failures-markup.xml

@@ -3731,18 +3731,6 @@ for more information.
                 something else is known to resolve the issue.
             </note>
         </mark-expected-failures>
-        <mark-expected-failures>
-            <test name="test_barrier_lib"/>
-            <toolset name="msvc-8.0"/>
-            <note author="Aleksey Gurtovoy" refid="6"/>
-        </mark-expected-failures>
-
-        <mark-expected-failures>
-            <test name="test_thread"/>
-            <toolset name="msvc-7.1"/>
-            <note author="Aleksey Gurtovoy" refid="6"/>
-        </mark-expected-failures>
-
         <mark-expected-failures reason="?">
             <test name="*_lib"/>
             <toolset name="gcc-2.95.3-stlport-4.5.3-linux"/>