CMake: Make all readers use isReadyNow() signal

The tealeafreader used to not ever use this signal and used
the isReady() method to short-circuit the whole mechanism.

Change-Id: I2f7caedeedf977c70a5d7807e3a92775757a6fef
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/cmakeprojectmanager/tealeafreader.cpp

@@ -152,6 +152,12 @@ TeaLeafReader::~TeaLeafReader()
     resetData();
 }
 
+void TeaLeafReader::setParameters(const BuildDirParameters &p)
+{
+    m_parameters = p;
+    emit isReadyNow();
+}
+
 bool TeaLeafReader::isCompatible(const BuildDirParameters &p)
 {
     if (!p.cmakeTool())