hg: build-infra/jdk8: Fixed objcopy again, on rebuild. Replaced a lot of shell commands with

[erik.joelsson at oracle.com]

Changeset: 36a2d0b4be02
Author:    erikj
Date:      2012-07-06 00:00 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/36a2d0b4be02

Fixed objcopy again, on rebuild. Replaced a lot of shell commands with
spec defined variables.

! common/makefiles/IdlCompilation.gmk
! common/makefiles/Makefile
! common/makefiles/NativeCompilation.gmk