Get real architecture of M1 Mac regardless of Rosetta

[Xheldon]

Get real architecture of M1 Mac regardless of Rosetta or node version, see #3239

[lovell]

Hi, thanks for taking the time to open a PR,

Are you able to explain a bit more about why this change is necessary, as the current logic is intentional and well-tested in the field.

Here's the background to why the isRosetta check exists in its current form:

#2460 (comment)

For Rosetta x64, it prevents the use of a globally-installed ARM64 libvips as this conflict with the use of x64 Node.js

On an M1/M2 based machine, the dylib files provided by a globally-installed vips (via Homebrew or otherwise) will be ARM64, therefore we cannot use these when running Node.js under x64 emulation as there will be a runtime conflict.

As an aside, I'll add a note to the docs about this at https://sharp.pixelplumbing.com/install#custom-libvips

[Xheldon]

Thanks for review this PR! @lovell

Let me explain the scenario I encountered. At first I wanted to convert the HEIC image format to PNG, but when I called the Sharp API it reported an error and prompted me Unsupport Feature , so I followed the prompts in this repository to install libvips globally.
But when I reinstalled Sharp, it still showing that I was not using global-installed libvips.
so I debugger the Sharp code, and when I step into the isRosetta function, I found that my 14.18.3 version of node installed via nvm is x64, and the value of sysctl sysctl.proc_translated is sysctl.proc_translated: 1.
After I installed the arm64 version of node(19.13.0), the problem was solved. So I'm trying to do a compatibility handling here, i.e. if node is x64, but the system is arm64, you still need to use globally-installed libvips.

After reading the introduction of isRosetta attached by you, I understand that my modification may be inappropriate, but please at least prompt the user in console to switch the x64 version of node to the native arm64 version, because I spent 1 hour on this to solve the HEIC to PNG conversion problem, thank you!

[lovell]

Logging added and docs updated via commit 5be36c2