CMake and Kits: Fix interaction between them

On initial run we offer the user a choice between all the kits, which
are compatible with the cached generator. After the initial run, the
user can't change kits nor generators anymore.
Except if the builds into a new directory or adds a buildconfiguration,
then the user can choose between generators but not kits.

Task-number: QTCREATORBUG-7940
Task-number: QTCREATORBUG-7928

Change-Id: I9b663435cd2e021f7fe08379c1c487a6aebe8976
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Peter Kümmel <syntheticpp@gmx.net>

src/plugins/projectexplorer/target.cpp

@@ -515,13 +515,6 @@ QVariantMap Target::toMap() const
     return map;
 }
 
-void Target::createDefaultSetup()
-{
-    updateDefaultBuildConfigurations();
-    updateDefaultDeployConfigurations();
-    updateDefaultRunConfigurations();
-}
-
 void Target::updateDefaultBuildConfigurations()
 {
     IBuildConfigurationFactory *bcFactory = IBuildConfigurationFactory::find(this);