python2.5 PyArg_ParseTuple fix

Python 2.5 doesn't like it when we mix str objects and the "t#" format
in PyArg_ParseTuple. Change it to use "s#". Tested with python 2.3, 2.4
and 2.5.

mercurial/base85.c

@@ -35,7 +35,7 b' b85encode(PyObject *self, PyObject *args'
 	unsigned int acc, val, ch;
         int pad = 0;
 
-	if (!PyArg_ParseTuple(args, "t#|i", &text, &len, &pad))
+	if (!PyArg_ParseTuple(args, "s#|i", &text, &len, &pad))
 		return NULL;
 
         if (pad)
@@ -82,7 +82,7 b' b85decode(PyObject *self, PyObject *args'
 	int len, i, j, olen, c, cap;
 	unsigned int acc;
 
-	if (!PyArg_ParseTuple(args, "t#", &text, &len))
+	if (!PyArg_ParseTuple(args, "s#", &text, &len))
 		return NULL;
 
 	olen = len / 5 * 4;

mercurial/bdiff.c

@@ -308,7 +308,7 b' static PyObject *bdiff(PyObject *self, P'
 	char encode[12], *rb;
 	int an, bn, len = 0, la, lb;
 
-	if (!PyArg_ParseTuple(args, "t#t#:bdiff", &sa, &la, &sb, &lb))
+	if (!PyArg_ParseTuple(args, "s#s#:bdiff", &sa, &la, &sb, &lb))
 		return NULL;
 
 	an = splitlines(sa, la, &al);