Bug#189059: libg2c0: no libg2c.so symlink

[Matthias Klose]

I'll add a README to libf2c package. Providing dummy packages
depending on the compiler is difficult. Which compiler should we
depend on? Making libg2c0-3.2 and libg2c0-3.3 packages looks ugly.

The same issue arises with the ObjC compiler.