Get rid of ifdefs for crash handler in main.cpp.

Adapt the *.pro and *.qbp files to build unconditionally since the
ifdefs are already inlined in the functions.

Change-Id: I492f39600222a6174d4e16546bfa5a289965e8cb
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>

src/app/main.cpp

@@ -229,9 +229,7 @@ int main(int argc, char **argv)
     const int threadCount = QThreadPool::globalInstance()->maxThreadCount();
     QThreadPool::globalInstance()->setMaxThreadCount(qMax(4, 2 * threadCount));
 
-#if defined(Q_OS_LINUX) && !defined(QT_NO_DEBUG)
     setupCrashHandler(); // Display a backtrace once a serious signal is delivered.
-#endif
 
 #ifdef ENABLE_QT_BREAKPAD
     QtSystemExceptionHandler systemExceptionHandler;
@@ -438,8 +436,6 @@ int main(int argc, char **argv)
 #endif
 
     const int r = app.exec();
-#if defined(Q_OS_LINUX) && !defined(QT_NO_DEBUG)
     cleanupCrashHandler();
-#endif
     return r;
 }