Improve the AxSelect-Dialog.

Give it a tooltip listing DLL, version and word size.
For 64 bit executables, append the 32 bit controls as
disabled controls at the end to make them visible.

Task-number: QTBUG-33711
Change-Id: I2800a78cfc826bd08c591f491bb42f22eeda5b25
Reviewed-by: Andy Shaw <andy.shaw@digia.com>