hg: jdk9/sandbox: 8073634: Improve clean targets

[chris.hegarty at oracle.com]

Changeset: 9fa2185bee17
Author:    erikj
Date:      2015-04-10 16:32 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/9fa2185bee17

8073634: Improve clean targets
Reviewed-by: ihse

! common/autoconf/basics.m4
! common/autoconf/basics_windows.m4
! common/autoconf/build-performance.m4
! common/autoconf/configure.ac
! common/autoconf/generated-configure.sh
! common/autoconf/spec.gmk.in
! common/autoconf/toolchain_windows.m4
! make/Main.gmk
! make/MainSupport.gmk