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/java/util/regex/Pattern.java

@@ -103,8 +103,11 @@ public final class Pattern implements Serializable
       }
     catch (REException e)
       {
-	throw new PatternSyntaxException(e.getMessage(),
+	PatternSyntaxException pse;
+	pse = new PatternSyntaxException(e.getMessage(),
 					 regex, e.getPosition());
+	pse.initCause(e);
+	throw pse;
       }
   }