Fixed bug 2560 - Crash on any input

Alex Marshall

On all of my OSX machines running 10.9 (I posted OS as Mac OS X (All) due to there not being a 10.9 selection), I get a crash on any input using SDL 1.2. I've had this issue in both HG 1.2 and final release 1.2 on the website.

Today I got around to trying to fix it; commenting out the two uses of 'field_edit' in src/video/quartz/SQL_QuartzEvents.m fixes the crash and doesn't cause any side effects as far as I can tell.
Backport gcc-fat.sh and g++-fat.sh to the 1.2 branch to help buildbot.
Fixed compiling SDL 1.2 with Xcode 5.1.1
m68k: Add missing sign extension
atari: Do not use system interrupt for handling timer. Do it from userspace, like RISCOS backend.