cmake HAVE_RWLOCK_INIT examples

alibaba/AliSQL configure.cmake :569 

CHECK_FUNCTION_EXISTS (rwlock_init HAVE_RWLOCK_INIT)

arkdb/arkproxy configure.cmake :386 

CHECK_FUNCTION_EXISTS (rwlock_init HAVE_RWLOCK_INIT)

alibaba/AliSQLBackup configure.cmake :484 

CHECK_FUNCTION_EXISTS (rwlock_init HAVE_RWLOCK_INIT)