mark up spirit library test karma_sequence that can take too long to compile with aC++

[SVN r50088]

status/explicit-failures-markup.xml

@@ -2920,6 +2920,7 @@ for more information.
         <mark-expected-failures>
             <test name="int_numerics"/>
             <test name="karma_pattern*"/>
+            <test name="karma_sequence"/>
             <test name="rule"/>
             <test name="sequence"/>
             <toolset name="acc"/>