cmake HAVE_SYNCH_H examples

alibaba/AliSQL configure.cmake :374 

CHECK_INCLUDE_FILES (synch.h HAVE_SYNCH_H)

arkdb/arkproxy configure.cmake :212 

CHECK_INCLUDE_FILES (synch.h HAVE_SYNCH_H)

alibaba/AliSQLBackup configure.cmake :290 

CHECK_INCLUDE_FILES (synch.h HAVE_SYNCH_H)

DCMTK/dcmtk CMake/GenerateDCMTKConfigure.cmake :318 

CHECK_INCLUDE_FILE_CXX("synch.h" HAVE_SYNCH_H)