hg: jdk/sandbox: Process extra header dirs syntax.

[magnus.ihse.bursie at oracle.com]

Changeset: 1b154e6d8bb2
Author:    ihse
Date:      2018-05-04 00:50 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/1b154e6d8bb2

Process extra header dirs syntax.

! make/common/JdkNativeCompilation.gmk
! make/lib/Awt2dLibraries.gmk
! make/lib/CoreLibraries.gmk
! make/lib/Lib-java.base.gmk
! make/lib/Lib-java.desktop.gmk
! make/lib/Lib-java.instrument.gmk
! make/lib/Lib-java.smartcardio.gmk
! make/lib/Lib-jdk.accessibility.gmk
! make/lib/Lib-jdk.jdi.gmk
! make/lib/Lib-jdk.jdwp.agent.gmk
! make/lib/Lib-jdk.sctp.gmk