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Suggested changes to MacOS to build reqs (#7715)

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Update compilingmame.rst
* Changes in macOS section regarding current build requirements
* Added basic info for Apple Silicon to macOS build instructions.
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docs/source/initialsetup/compilingmame.rst
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@ -266,37 +266,26 @@ Compilation is exactly as described above in All Platforms.
Apple macOS
-----------
You’ll need a few prerequisites to get started. Make sure you’re on OS X 10.9
Mavericks or later. You will need SDL2 2.0.4 or later for macOS.
You’ll need a few prerequisites to get started. Make sure you’re on OS X 10.14
Mojave or later for Intel Macs or macOS 11.0 Big Sur for Apple Silicon. You will need SDL2 2.0.4 or later for Intel or SDL2 2.0.14 on Apple Silicon.
* Install **Xcode** from the Mac App Store
* Install **Xcode** from the Mac App Store or `ADC <https://developer.apple.com/download/more/>`_ (AppleID required).
* To find the corresponding Xcode for your MacOS release please visit `xcodereleases.com <https://xcodereleases.com>`_ to find the latest version of Xcode available to you.
* Launch **Xcode**. It will download a few additional prerequisites. Let this
run through before proceeding.
* Once that’s done, quit **Xcode** and open a **Terminal** window
* Type **xcode-select --install** to install additional tools necessary for MAME
* Type **xcode-select --install** to install additional tools necessary for MAME (also available as a package on ADC).
Next you’ll need to get SDL2 installed.
* Go to `this site <http://libsdl.org/download-2.0.php>`_ and download the *Mac OS X* .dmg file
* If the .dmg doesn’t auto-open, open it
* Click “Macintosh HD” (or whatever your Mac’s hard disk is named) in the left pane of a **Finder** window, then open the **Library** folder and drag the **SDL2.framework** folder from the SDL disk image into the **Frameworks** folder
* Click “Macintosh HD” (your Mac’s hard disk) in the Locations sidebar of a **Finder** window, then open the **Library** folder and drag the **SDL2.framework** folder from the SDL disk image into the **Frameworks** folder. You will have to authenticate with your user password.
Lastly to begin compiling, use Terminal to navigate to where you have the MAME
source tree (*cd* command) and follow the normal compilation instructions from
above in All Platforms.
It’s possible to get MAME working from 10.6, but a bit more complicated:
* You’ll need to install clang-3.7, ld64, libcxx and python27 from MacPorts
* Then add these options to your make command or useroptions.mak:
.. code-block:: bash
OVERRIDE_CC=/opt/local/bin/clang-mp-3.7
OVERRIDE_CXX=/opt/local/bin/clang++-mp-3.7
PYTHON_EXECUTABLE=/opt/local/bin/python2.7
ARCHOPTS=-stdlib=libc++
.. _compiling-emscripten: