don't distinguish between int and long

if no type is explicitly specified, send as int32 if possible, otherwise
use int64 automatically.
Py3 has no separate 'long' type anyway, and on 64 bit systems the ranges
of Py2's int and C's int32_t don't match.

Author: sebastinas

src/liblo.pyx

@@ -20,6 +20,8 @@ from libc.stdlib cimport malloc, free
 cdef extern from 'math.h':
     double modf(double x, double *iptr)
 
+from libc.stdint cimport int32_t, int64_t
+
 from liblo cimport *
 
 import inspect as _inspect
@@ -820,10 +822,11 @@ cdef class Message:
             lo_message_add_true(self._message)
         elif value is False:
             lo_message_add_false(self._message)
-        elif isinstance(value, int):
-            lo_message_add_int32(self._message, int(value))
-        elif isinstance(value, long):
-            lo_message_add_int64(self._message, long(value))
+        elif isinstance(value, (int, long)):
+            try:
+                lo_message_add_int32(self._message, <int32_t>value)
+            except OverflowError:
+                lo_message_add_int64(self._message, <int64_t>value)
         elif isinstance(value, float):
             lo_message_add_float(self._message, float(value))
         elif isinstance(value, (bytes, unicode)):