A user noticed that the sim assigns the result of a call to 'signal'
to a variable like:
RETSIGTYPE (*prev_sigint) ();
However, it's more correct to use (int) here.
This patch fixes the error.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32466
Approved-By: Andrew Burgess <aburgess@redhat.com>