Set environment variable to force GCCE version when running qmake
for symbian. This is only relevant for the SBSv2 build system.

Add more error messages to processes run for toolchain detection.
Move Windows-specific code to dbgwinutils, remove inclusion of
<windows.h>. Fix MinGW gcc 4.5 warnings.

 * Simplify logic while at it, too.

 * Export SBS_GCCE<VERSION>BIN containing the path to the GCCE compiler
   used.

Task-number: QTCREATORBUG-1224
Reviewed-by: aportale

and make it possible to configure it in the settings.
Split up S60Devices up into a class hierarchy and implement
the Autodetected Windows case and the manually configured
Linux case separately for code clarity. Same with the settings
widgets.
Reviewed-by: con

Move code to locate gcce from S60Manager to CCE toolchain and make it
handle empty GCCE-root's correctly (locate compiler in path and
warn if none found). Set up environment correctly.

Factor out the initialization setting up the environment and headers in
the RVCT/GCCE toolchains.
Modify the RunControl to be able to support different package
building/signing processes.

Reviewed-by: dt

The tool chains' "equals" methods where out of date.

Reviewed-by: dt
Reviewed-by: Robert Loehning

Also makes the code a lot smaller.

It works, except that the code model doesn't get the rvct include
directories and defines yet. And you need to have everything for
rvct set up in your environment.

One less need for qmakestep.

Passing the Project to the tool chain now. Not quite sure if I like it.