Formal protocol checking should use type compatibility, not a hard check

[ronaldoussoren]

The script below defines a dummy class implementing a Cocoa protocol:

import Cocoa
import objc

class AppDelegate( Cocoa.NSObject, protocols=[objc.protocolNamed("NSApplicationDelegate")]):
    pass

This currently fails due to the base class not passing the protocol conformance check. This can be fixed by treating bool/NSBOOL/char compatible. Same for long and long long (assuming 64-bit). Needs tests as well.

Error:

Traceback (most recent call last):
  File "bug.py", line 4, in <module>
    class AppDelegate( Cocoa.NSObject, protocols=[objc.protocolNamed("NSApplicationDelegate")]):
TypeError: class AppDelegate does not correctly implement protocol NSApplicationDelegate: the signature for method 'respondsToSelector:' is c@:: instead of B24@0:8:16