hg: build-infra/jdk9/hotspot: Differentiate between CFLAGS for global disabling of precomp header and selective exclusion of it

[erik.joelsson at oracle.com]

Changeset: 737a2c45b557
Author:    erikj
Date:      2016-02-29 14:30 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/hotspot/rev/737a2c45b557

Differentiate between CFLAGS for global disabling of precomp header and selective exclusion of it

! makefiles/lib/CompileJvm.gmk