cmake GDCM_HAVE_PTHREAD_H examples

malaterre/GDCM CMakeLists.txt :601 

CHECK_INCLUDE_FILE("pthread.h"      GDCM_HAVE_PTHREAD_H)

InsightSoftwareConsortium/ITK Modules/ThirdParty/GDCM/src/gdcm/CMakeLists.txt :601 

CHECK_INCLUDE_FILE("pthread.h"      GDCM_HAVE_PTHREAD_H)