remove GNU Classpath and Apache Harmony compatibility code

Rather than try to support mixing Avian's core classes with those of
an external class library -- which necessitates adding a lot of stub
methods which throw UnsupportedOperationExceptions, among other
comprimises -- we're looking to support such external class libraries
in their unmodified forms.  The latter strategy has already proven
successful with OpenJDK's class library.  Thus, this commit removes
the stub methods, etc., which not only cleans up the code but avoids
misleading application developers as to what classes and methods
Avian's built-in class library supports.

classpath/java/util/regex/Matcher.java

@@ -36,18 +36,6 @@ public class Matcher {
     }
   }
 
-  public boolean requireEnd() {
-    throw new UnsupportedOperationException();
-  }
-
-  public boolean hitEnd() {
-    throw new UnsupportedOperationException();
-  }
-
-  public boolean lookingAt() {
-    throw new UnsupportedOperationException();
-  }
-
   public Matcher reset() {
     return reset(input);
   }
@@ -63,26 +51,6 @@ public class Matcher {
     return start;
   }
 
-  public int start(int group) {
-    throw new UnsupportedOperationException();
-  }
-
-  public Pattern pattern() {
-    throw new UnsupportedOperationException();
-  }
-
-  public Matcher region(int start, int end) {
-    throw new UnsupportedOperationException();
-  }
-
-  public int regionEnd() {
-    throw new UnsupportedOperationException();
-  }
-
-  public int regionStart() {
-    throw new UnsupportedOperationException();
-  }
-
   public String replaceAll(String replacement) {
     return replace(replacement, Integer.MAX_VALUE);
   }
@@ -124,10 +92,6 @@ public class Matcher {
     return end;
   }
 
-  public int end(int group) {
-    throw new UnsupportedOperationException();
-  }
-
   public boolean find() {
     return find(end);
   }
@@ -143,16 +107,4 @@ public class Matcher {
       return false;
     }
   }
-
-  public int groupCount() {
-    throw new UnsupportedOperationException();
-  }
-
-  public String group() {
-    throw new UnsupportedOperationException();
-  }
-
-  public String group(int group) {
-    throw new UnsupportedOperationException();
-  }
 }

classpath/java/util/regex/Pattern.java

@@ -92,10 +92,6 @@ public class Pattern {
     return pattern;
   }
 
-  public static String quote(String s) {
-    throw new UnsupportedOperationException();
-  }
-
   public String[] split(CharSequence input) {
     return split(input, 0);
   }