Corrected mingw toolset naming.

[SVN r36951]

status/explicit-failures-markup.xml

@@ -31,8 +31,8 @@
     <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-3.4.2_mingw" status="required"/>
-    <mark-toolset name="gcc-3.4.5_mingw" status="required"/>
+    <mark-toolset name="gcc-mingw-3.4.2" status="required"/>
+    <mark-toolset name="gcc-mingw-3.4.5" status="required"/>
     <mark-toolset name="gcc-3.3.6" status="required"/>
     <mark-toolset name="gcc-cygwin-3.4.4" status="required"/>
     <mark-toolset name="gcc-3.2.3_linux" status="required"/>