[obish/cris] Delete extract_struct_value_address

[Andrew Cagney <cagney@gnu.org>]

Orjan,

The attached deletes cris's implementation of 
extract_struct_value_address.  Knowing two things make deleting it 
relatively obvious:

- infrun.c's been rewritten so that it never calls 
extract_struct_value_address, hence the "trick" of saving the return 
value's address in a global is never exploited

- as the comments note, the ABI doesn't preserve the return address 
register and hence the other potential caller (code trying to extract 
the return value) doesn't apply

BTW, suggest looking at "return_value", implementing it has a dramatic 
effect on the test results from structs.exp.

enjoy, (committed)
Andrew