Avoid C compiler warnings about implicit type conversions (on Windows, long != Py_ssize_t).

Cython/Compiler/Scanning.pxd

@@ -37,7 +37,7 @@ cdef class PyrexScanner(Scanner):
     cdef public unicode sy
     cdef public systring  # EncodedString
 
-    cdef long current_level(self)
+    cdef Py_ssize_t current_level(self)
     #cpdef commentline(self, text)
     #cpdef open_bracket_action(self, text)
     #cpdef close_bracket_action(self, text)
@@ -45,7 +45,7 @@ cdef class PyrexScanner(Scanner):
     #cpdef begin_string_action(self, text)
     #cpdef end_string_action(self, text)
     #cpdef unclosed_string_action(self, text)
-    @cython.locals(current_level=cython.long, new_level=cython.long)
+    @cython.locals(current_level=Py_ssize_t, new_level=Py_ssize_t)
     cpdef indentation_action(self, text)
     #cpdef eof_action(self, text)
     ##cdef next(self)