THRIFT-3646 Fix Python extension build warnings
Client: Python
Patch: Nobuaki Sukegawa

This closes #877
diff --git a/lib/py/src/ext/protocol.tcc b/lib/py/src/ext/protocol.tcc
index 554ba6e..9c25841 100644
--- a/lib/py/src/ext/protocol.tcc
+++ b/lib/py/src/ext/protocol.tcc
@@ -101,7 +101,7 @@
     return false;
   }
   if (len != size) {
-    PyErr_Format(PyExc_EOFError, "write length mismatch: expected %d got %d", size, len);
+    PyErr_Format(PyExc_EOFError, "write length mismatch: expected %lu got %d", size, len);
     return false;
   }
   return true;
@@ -246,11 +246,11 @@
 template <typename Impl>
 bool ProtocolBase<Impl>::checkLengthLimit(int32_t len, long limit) {
   if (len < 0) {
-    PyErr_Format(PyExc_OverflowError, "negative length: %d", limit);
+    PyErr_Format(PyExc_OverflowError, "negative length: %ld", limit);
     return false;
   }
   if (len > limit) {
-    PyErr_Format(PyExc_OverflowError, "size exceeded specified limit: %d", limit);
+    PyErr_Format(PyExc_OverflowError, "size exceeded specified limit: %ld", limit);
     return false;
   }
   return true;