Integrating enabler for Creator in Qt 4.7.1 (crash handler)

Integrating enabler for Creator in Qt 4.7.1 (crash handler)

We need two uncritical patches integrated into 4.7.1:

7412ac5b38d83b627a372a525f271c225f9c1f70
1a99cdbb36334e17c34b38dd5df1bdd70167b42a

This patches do absolutely nothing if not activated by an enviroment variable.
They enable a crash handler for Qt Creator 2.1 which is a critical feature.

The whole story:

We have integrated a crash handler in Creator. There is a crash server, a client and a build server part. The build server is sending symbol informations to the crash server so the crash dump from the client can be analyzed. This two patches are implementing an extra qmake post link step if the breakpad integration is available and activated. It is activated by an environment variable. There is no difference if this variable isn't set.