cmake HAVE_PTHREAD_CONDATTR_CREATE examples

alibaba/AliSQL configure.cmake :554 

CHECK_FUNCTION_EXISTS (pthread_condattr_create HAVE_PTHREAD_CONDATTR_CREATE)

arkdb/arkproxy configure.cmake :376 

CHECK_FUNCTION_EXISTS (pthread_condattr_create HAVE_PTHREAD_CONDATTR_CREATE)

alibaba/AliSQLBackup configure.cmake :470 

CHECK_FUNCTION_EXISTS (pthread_condattr_create HAVE_PTHREAD_CONDATTR_CREATE)