hg: build-infra/jdk8/jdk: Clean up old LEGACY_OPENJDK_TARGET_CPU2:

[magnus.ihse.bursie at oracle.com]

Changeset: 7fa8ab2adaf5
Author:    ihse
Date:      2012-08-16 13:10 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/jdk/rev/7fa8ab2adaf5

Clean up old LEGACY_OPENJDK_TARGET_CPU2:
* Rename it to OPENJDK_TARGET_CPU_LIBDIR
* Remove old use of LIBARCH.

! makefiles/CompileLaunchers.gmk
! makefiles/CompileNativeLibraries.gmk
! makefiles/CopyFiles.gmk
! makefiles/GensrcX11Wrappers.gmk
! makefiles/Import.gmk