Class.h (next): Updated documentation.

Class.h (next): Updated documentation.

	* java/lang/Class.h (next): Updated documentation.  Renamed to
	'next_or_version'.
	* java/lang/natClassLoader.cc (_Jv_RegisterClasses): Use
	_Jv_CheckABIVersion.
	(_Jv_RegisterClasses_Counted): Likewise.
	(_Jv_RegisterClassHookDefault): Fix starting condition of
	duplicate-checking loop.
	* include/jvm.h (GCJ_VERSION): New define.
	(GCJ_BINARYCOMPAT_ADDITION): Likewise.
	(_Jv_CheckABIVersion): New function.

From-SVN: r94173