libf2c: fixing hash.

The changes:

diff -r lold/arithchk.c l/arithchk.c
218a219,221
>               if (sizeof(long long) > sizeof(long)
>                && sizeof(long long) == sizeof(void*))
>                       fprintf(f, "#define LONG_LONG_POINTERS\n");
diff -r lold/README l/README
41c41
< message to netlib@netlib.bell-labs.com
---
> message to netlib@netlib.org
New URLs for coin3d
I forgot to bring back opencascade 6.5 overrides.