hg: jdk8u/monojdk8u-dev: 8210283: Support git as an SCM alternative in the build

[sgehwolf at redhat.com]

Changeset: a3703bfe827b
Author:    erikj
Date:      2018-09-07 14:54 -0700
URL:       https://hg.openjdk.java.net/jdk8u/monojdk8u-dev/rev/a3703bfe827b

8210283: Support git as an SCM alternative in the build
Summary: Removes forest handling of SCM ids
Reviewed-by: andrew

+ .gitignore
! common/autoconf/basics.m4
! common/autoconf/generated-configure.sh
! common/autoconf/spec.gmk.in
! make/common/MakeBase.gmk