Imported GNU Classpath 0.20

Imported GNU Classpath 0.20
       * Makefile.am (AM_CPPFLAGS): Add classpath/include.
       * java/nio/charset/spi/CharsetProvider.java: New override file.
       * java/security/Security.java: Likewise.
       * sources.am: Regenerated.
       * Makefile.in: Likewise.

From-SVN: r109831

libjava/classpath/gnu/xml/stream/XMLStreamWriterImpl.java

@@ -282,6 +282,8 @@ public class XMLStreamWriterImpl
   public void writeEndElement()
     throws XMLStreamException
   {
+    if (elements.isEmpty())
+      throw new IllegalStateException("no matching start element");
     try
       {
         endStartElement();