STYLE: Remove VCL_INCLUDE_CXX_0X outdated reference.

Change-Id: I3ea3f89f6a8ab1de36ef192d35e984267ea86448

Author: hjmjohnson

Modules/ThirdParty/VNL/CMakeLists.txt

@@ -56,7 +56,6 @@ else()
     VXL_BUILD_FOR_VXL_DASHBOARD
     VXL_BUILD_NONDEPRECATED_ONLY
     VXL_TESTLIB_VCL_WHERE_ROOT_DIR_H
-    VCL_INCLUDE_CXX_0X
     VXL_EXTRA_CMAKE_CXX_FLAGS
     VXL_EXTRA_CMAKE_C_FLAGS
     VXL_EXTRA_CMAKE_EXE_LINKER_FLAGS