cmake HAVE_TR1_UNORDERED_MAP_HEADER examples

plumonito/dtslam 3rdparty/ceres-solver-1.9.0/CMakeLists.txt :469 

CHECK_INCLUDE_FILE_CXX("tr1/unordered_map" HAVE_TR1_UNORDERED_MAP_HEADER)

plumonito/dtslam 3rdparty/ceres-solver-1.9.0/CMakeLists.txt :477 

ENDIF (HAVE_TR1_UNORDERED_MAP_HEADER)