eigen3: remove patch that was rejected upstream

Eigen's intention here was that if the user is going to print their
types via something like
```
os << matrix;
```
then they should be including `<ostream>` explicitly on their own,
and not rely on a transitively included header.  So this was by
design.  As it is, it should build and run if
- you never actually call those functions, and don't include `<ostream>` on your own
- you do call those functions, and do include `<ostream>` in your own.

Bump PKGREVISION.

(wiz)