ConsoleProcess: Remove assert

This can happen legitimately nowadays.

Change-Id: I9dbd8021465678c07ef3d2f569f734c459cb3589
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/libs/utils/consoleprocess_unix.cpp

@@ -67,7 +67,6 @@ ConsoleProcess::ConsoleProcess(QObject *parent)  :
 
 qint64 ConsoleProcess::applicationMainThreadID() const
 {
-    QTC_CHECK(false);
     return -1;
 }