git: openjdk/mobile: 8232133: Change to GCC 8.3 for building on Linux at Oracle

[duke]

Changeset: 32540b6f
Author:    Erik Joelsson <erikj at openjdk.org>
Date:      2019-10-11 06:38:52 +0000
URL:       https://git.openjdk.java.net/mobile/commit/32540b6f

8232133: Change to GCC 8.3 for building on Linux at Oracle

Reviewed-by: kbarrett, dholmes, ihse

! doc/building.html
! doc/building.md
! make/conf/jib-profiles.js
! make/devkit/Tools.gmk