Drop support for python 3.1.

for building py3.2 on *nix see:
  http://wiki.blender.org/index.php?title=Dev:2.5/Doc/Building_Blender/Linux/Troubleshooting#Python

also fixed possible buffer overrun with getting the fake filepath for a blender textblock.

source/blender/python/generic/py_capi_utils.c

@@ -60,18 +60,6 @@ void PyC_LineSpit(void) {
 	fprintf(stderr, "%s:%d\n", filename, lineno);
 }
 
-/* python 3.2 only, copied from frameobjec.c */
-#if PY_VERSION_HEX <  0x03020000
-int
-PyFrame_GetLineNumber(PyFrameObject *f)
-{
-    if (f->f_trace)
-        return f->f_lineno;
-    else
-        return PyCode_Addr2Line(f->f_code, f->f_lasti);
-}
-#endif
-
 void PyC_FileAndNum(const char **filename, int *lineno)
 {
 	PyFrameObject *frame;