This is weird, but to avoid a compiler warning when we define this ourselves it should be defined as long rather than int.

```warning: comparison of constant -9223372036854775808 with expression of type 'const int' is always true [-Wtautological-constant-out-of-range-compare]
  if (LONG_MIN <= (SSL_OP_NO_TLSv1_1) && (SSL_OP_NO_TLSv1_1) <= LONG_MAX)```

It's an odd artifact of cffi's codegen.