Use correct OpenSSL thread safety macros on OS X (closes #209) Create an Autoconf test to determine if pthread_t is a pointer or scalar type, and use the appropriate CRYPTO_THREADID_set macro based on the result.

table t : {A : int}

fun main () : transaction page =
    () <- dml (INSERT INTO t (A) VALUES (0));
    return (error <xml>No way, Jose!</xml>)