[0.98 merge] Generalise native methods for StringBuffer/Builder

[Andrew John Hughes <gnu_andrew at member dot fsf dot org>]

This patch removes a lot of unnecessary differences
between the implementations of StringBuffer and StringBuilder
in GNU Classpath and provides one implementation of the native
methods used by these classes.  Using one native implementation
in AbstractStringBuilder means we also don't run into as many
problems with bridge methods.

With this patch, we could probably remove StringBuilder.java altogether
as it becomes identical to the one in GNU Classpath.  StringBuffer retains
a single difference; the use of System over VMSystem.

ChangeLog:

2008-09-08  Andrew John Hughes  <gnu_andrew@member.fsf.org>

	* Makefile.am: Replace natStringBuffer.cc
	and natStringBuilder.cc with natAbstractStringBuffer.cc.
	* Makefile.in: Regenerated.
	* java/lang/AbstractStringBuffer.java:
	(append(int)): Made native.
	(regionMatches(int,String)): Likewise.
	* java/lang/StringBuffer.h: Regenerated.
	* java/lang/StringBuffer.java: Remerged with GNU Classpath.
	* java/lang/StringBuilder.h: Regenerated.
	* java/lang/StringBuilder.java: Remerged with GNU Classpath.
	* java/lang/natAbstractStringBuffer.cc: Provide common
	native methods for StringBuffer and StringBuilder.
	* java/lang/natStringBuffer.cc,
	* java/lang/natStringBuilder.cc: Removed.

-- 
Andrew :)

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