Revert "Remove the CFFI compile_module monkey patch"

This reverts commit 8511afd9.

nacl/nacl.py

@@ -148,6 +148,12 @@ class Library(object):
         self._ffi = ffi
         self._initalized = False
 
+        # This prevents the compile_module() from being called, the module
+        # should have been compiled by setup.py
+        def _compile_module(*args, **kwargs):
+            raise RuntimeError("Cannot compile module during runtime")
+        self._ffi.verifier.compile_module = _compile_module
+
     def __getattr__(self, name):
         if not self._initalized:
             self._lib = self._ffi.verifier.load_library()