cmake HAVE_RWLOCK_INIT examples

arkdb/inception configure.cmake :462 

CHECK_FUNCTION_EXISTS (rwlock_init HAVE_RWLOCK_INIT)

alibaba/AliSQL configure.cmake :569 

CHECK_FUNCTION_EXISTS (rwlock_init HAVE_RWLOCK_INIT)

Tokutek/mysql-5.5 configure.cmake :402 

CHECK_FUNCTION_EXISTS (rwlock_init HAVE_RWLOCK_INIT)