Set minimum deployment target for macOS builds

[messmerd]

Our macOS builds do not set a minimum deployment target, which (I believe) makes XCode/AppleClang default to the same version as the host. So on Nightly, this would mean the minimum macOS version is 13 (Ventura) on x86_64 and 14 (Sonoma) on arm64. This places an unnecessary restriction on users, which is a problem.

So I've lowered the minimum deployment target to the lowest values it will allow:
10.13 (High Sierra) for x86_64, and 11.0 (Big Sur) for arm64

NOTE: I added the minimum deployment target to the ccache key. I'm not really sure if this is necessary. If not, I can remove it.

[Mr-Emoticon63]

OH MY GOD THANK YOU SO MUCH YOU ARE AMAZING also can you explain how you did this I really want to know :)

Edit: Just checked the nightly and it still says that it requires MacOS 13.7 for whatever reason.

[messmerd]

@Mr-Emoticon63 Thanks! I just had to set a compiler option to allow support for older macOS versions.

This isn't in nightly yet (since this PR hasn't been merged), but you can try it out here: https://lmms.io/download/pull-request/8004

If you do try it out, please let me if it worked for you. I don't have a Mac so I can't test it myself.

[Mr-Emoticon63]

it’s not loading for whatever reason.

[Mr-Emoticon63]

it just says “504 Gateway Time-out”

[Mr-Emoticon63]

uh oh none of the lmms website is loading 🥲

[AW1534]

uh oh none of the lmms website is loading 🥲

The website is down currently, but the latest build in this PR (as of when this comment is uploaded) can be grabbed from here: https://github.com/LMMS/lmms/actions/runs/16230943390#artifacts

[Mr-Emoticon63]

yeah it worked. Now we just wait for the review.