Add standard defines to PREDICATES_FAST_FMA check

[here-abarany]

Should allow for fast FMA on non-x86 architectures, most notably ARM.

[artem-ogre]

Hi, @here-abarany,

Thanks for the pull request, it looks good from a quick glance. I will double-check, read the docs, and merge it soon.

I have a couple of curiosity questions:

• Do you have cases when you actually notice any performance difference with/without FMA? Or it's just something you randomly stumbled upon?
• I am really curious if CDT is used for anything at heremaps?

[here-abarany]

To answer your questions:

1. This is something I stumbled upon when trying to debug an issue we encountered when running in the cloud. (AWS Graviton 3 instances) It turned out to not be the problem, it was related to some bad inputs caused by a bug on our side, but figured it was still worth submitting.
2. Yes, I am working on a 3D map product and we are using CDT to triangulate our terrain.

[artem-ogre]

Thanks again for the contribution 👍