USE_AUTOBREAK does not work correctly with gdb

1. Open simple.pro from Creator's repository.
2. Change USE_AUTOBREAK to 1.
3. Build this with gcc/MinGW.
4. Run it in debugger.
   The Application Output tab will state: "Creator: Switch off magic autorun." The debugger will stop at each line containing "BREAK_HERE" but will run right on after an instant. This is the same behaviour like when using "USE_AUTORUN" which is unusable for manual testing.

Instead, the debugger should stop at "BREAK_HERE" and stay there until the tester/user tills them to run on.