RFR: 7537: build script assumes that Darwin always targets x86_64

[Patrick Reinhart]

On Thu, 20 Jan 2022 10:38:35 GMT, Johannes Bechberger <duke at openjdk.java.net> wrote:

> Tested on Mac M1.

Changes requested by reinhapa (Committer).

build.sh line 10:

> 8: if [[ "`uname -m`" =~ "arm64" ]]; then 
> 9:   ARCH="aarch64"
> 10: fi

I think we could use result from `uname -m` in any case:

  ARCH=`uname -m`

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PR: https://git.openjdk.java.net/jmc/pull/366