hg: build-infra/jdk8/jdk: Clean up old LEGACY_OPENJDK_TARGET_CPU3:

[magnus.ihse.bursie at oracle.com]

Changeset: d84c0560c2c7
Author:    ihse
Date:      2012-08-16 11:25 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/jdk/rev/d84c0560c2c7

Clean up old LEGACY_OPENJDK_TARGET_CPU3:
* Rename it to OPENJDK_TARGET_CPU_ISADIR
* Remove old use of ISA_DIR.

! makefiles/CompileNativeLibraries.gmk