Integrated: Fixes needed for mach5

[Jorn Vernee]

On Tue, 31 May 2022 16:21:45 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> This patch adds the wrapper Makefile from the jdk repo to the jextract repo, and moves the existing Makefile contents to `make/Init.gmk` (mirroring jdk).
> 
> The wrapper will set the `topdir` variable, which is then used in `Init.gmk` to include the common makefile, as well as cd into the right working directory before running the `Build.gmk` and `RunTestsPrebuilt.gmk` makefiles

This pull request has now been integrated.

Changeset: 2f84082f
Author:    Jorn Vernee <jvernee at openjdk.org>
Committer: Maurizio Cimadamore <mcimadamore at openjdk.org>
URL:       https://git.openjdk.java.net/jextract/commit/2f84082f0e720fd5d093af87ace530e4c5243814
Stats:     142 lines in 2 files changed: 90 ins; 0 del; 52 mod

Fixes needed for mach5

Reviewed-by: mcimadamore

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PR: https://git.openjdk.java.net/jextract/pull/46