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

[erik.joelsson at oracle.com]

Changeset: 0f440da9bb47
Author:    erikj
Date:      2016-02-29 14:30 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/rev/0f440da9bb47

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

! make/common/NativeCompilation.gmk