hg: jdk/client: 8250894: Provide a configure option to build and run against the platform libharfbuzz

[philip.race at oracle.com]

Changeset: 880cfb985f8e
Author:    prr
Date:      2020-08-04 12:20 -0700
URL:       https://hg.openjdk.java.net/jdk/client/rev/880cfb985f8e

8250894: Provide a configure option to build and run against the platform libharfbuzz
Reviewed-by: erikj

! make/autoconf/help.m4
! make/autoconf/lib-bundled.m4
! make/autoconf/spec.gmk.in
! make/modules/java.desktop/Copy.gmk
! make/modules/java.desktop/lib/Awt2dLibraries.gmk