Fix several issues for Linux around casting SDKManager to concrete class:
mostly with reading devices.xml which Unix does not support. Migrated
ISDKManager#getMinimumSupportedSBSv2Version() to API. Can now import and create Symbian projects.
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
<classpathentry sourcepath="/com.nokia.sdt.utils/libs/rhino1_6R2/src" kind="lib" path="/com.nokia.sdt.utils/libs/rhino1_6R2/js.jar"/>
<classpathentry kind="output" path="bin"/>
</classpath>