[Pyrex] Patch for C++ and warning reduction

[Lenard Lindstrom]

The second Pyrex 0.9.3.1 patch for C++ support is now available at 
the Pyrex web site. Combined with the first patch it is intended to 
allow any Pyrex program to compile with C++. Used by itself it 
reduces the number of C compiler warnings and removes an lvalue cast 
involving cdef'd extension type attributes of extension types.

This patch is preliminary. But it has been validated on the Pyrex 
test suite, both with C and C++. As with the first patch, this patch 
does not handle issues such as C++ exceptions. That will require a 
special Pyrex C++ mode and Pyrex language extensions.

A final note regarding the accompanying readme file. The patch 
command line should be

patch -c -i revised_casting.patch

It assumes the file revised_casting.patch is also in the 
Pyrex/Compiler directory.

Enjoy.

Lenard Lindstrom
<len-l at telus.net>