Message 93631 - Python tracker

Currently, inspect.isabstract() may return an integer like 1048576 
instead of True, or 0 instead of False.

Although technically correct, no other isXXX function behaves that way; 
also, isgeneratorfunction() uses a similar code construct but casts the 
result into a boolean.

The attached patch makes inspect.isabstract() return a boolean value 
always.