Add boost::filesystem to shipped Windows DLLs

buildconfig/CMake/WindowsNSIS.cmake

@@ -75,6 +75,7 @@ endforeach()
 # Other third party dependencies
 set ( BOOST_DIST_DLLS
     boost_date_time-mt.dll
+    boost_filesystem-mt.dll
     boost_python27-mt.dll
     boost_regex-mt.dll
     boost_serialization-mt.dll
@@ -248,4 +249,4 @@ if ( PACKAGE_WORKBENCH )
     Delete \\\"$DESKTOP\\\\${MANTIDWORKBENCH_LINK_NAME}\\\"
     ${CPACK_NSIS_EXTRA_UNINSTALL_COMMANDS}
   ")
-endif ()
\ No newline at end of file
+endif ()