cygwin/java patches for 3.1

[Billinghurst, David (CRTS)]

I'd like to apply the following patches from 3.2 to 3.1
(before I forget).  They are tweaks to get libjava to build 
on cygwin. 

2002-05-09  David.Billinghurst  <David.Billinghurst@riotinto.com>

	* testsuite/lib/libjava.exp (test_libjava_from_javac):
	Append .exe to executable names.  Fix for cygwin.
http://gcc.gnu.org/ml/java-patches/2002-q2/msg00327.html

2002-05-06  David.Billinghurst  <David.Billinghurst@riotinto.com>

	* testsuite/lib/libjava.exp (libjava_arguments): Don't link
	with -no-install on *-*-cygwin*.
http://gcc.gnu.org/ml/java-patches/2002-q2/msg00293.html

2002-05-04  David Billinghurst  <David.Billinghurst@riotinto.com>

	* testsuite/lib/libjava.exp (test_libjava_from_source):
	Append .exe to executable names.  If no suffix is present,
	then ".exe" is added by default on win32.  Harmless
	elsewhere so always do it.
http://gcc.gnu.org/ml/java-patches/2002-q2/msg00281.html

2002-05-03  David Billinghurst  <David.Billinghurst@riotinto.com>
	    Tom Tromey  <tromey@redhat.com>

	* java/lang/natSystem.cc (getSystemTimeZone): Use
	HAVE_UNDERSCORE_TIMEZONE.
	* include/config.h.in: Rebuilt.
	* acconfig.h (HAVE_UNDERSCORE_TIMEZONE, HAVE_BACKTRACE): Undef.
	* aclocal.m4, configure: Rebuilt.
	* acinclude.m4: Run AC_EXEEXT.
	* configure.in: Adjust test for `timezone' so it fails on Cygwin.
	Add test for `_timezone'.