Update platform file to ignore vt

This commit was SVN r24840.

contrib/platform/cisco/linux

@@ -23,6 +23,7 @@ enable_per_user_config_files=no
 enable_script_wrapper_compilers=no
 enable_orterun_prefix_by_default=yes
 enable_io_romio=no
+enable_vt=no
 enable_mca_no_build=carto,crs,memchecker,snapc,crcp,paffinity,filem,sstore,compress,rml-ftrm
 with_memory_manager=no
 with_tm=no