[QNX] Fix qmake environment resolving

Use the updateEnvironment function instead of
checking manually the env.

Change-Id: I20cba82dab833359854d786ec6403c4bfe417243
Reviewed-by: Tobias Nätterlund <tobias.naetterlund@kdab.com>
Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>
Reviewed-by: Mehdi Fekari <mfekari@rim.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/qnx/qnxabstractqtversion.cpp

@@ -103,12 +103,8 @@ void QnxAbstractQtVersion::addToEnvironment(const ProjectExplorer::Kit *k, Utils
 
 Utils::Environment QnxAbstractQtVersion::qmakeRunEnvironment() const
 {
-    if (!m_environmentUpToDate && !sdkPath().isEmpty())
-    {
-        // TODO: return Utils::Environment instead(?)
-        m_envMap = QnxUtils::parseEnvironmentFile(QnxUtils::envFilePath(sdkPath()));
-        m_environmentUpToDate = true;
-    }
+    if (!sdkPath().isEmpty())
+        updateEnvironment();
 
     Utils::Environment env = Utils::Environment::systemEnvironment();
     QnxUtils::prependQnxMapToEnvironment(m_envMap, env);