Remove unnecessary <exception> includes.

Bug 18720257

Change-Id: I33917bedd2861b64ca0480b66861b2a25451188c
Reviewed-on: https://swiftshader-review.googlesource.com/2655
Reviewed-by: Greg Hartman <ghartman@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>