provide implementations for C numeric operations builtins

[Emmankoko]

@dkorpel

[dlang-bot]

Thanks for your pull request and interest in making D better, @Emmankoko! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
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Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#22102"

[thewilsonator]

Just doublecheck that none of these are #defined in importc.h

[dkorpel]

Looks good! Have you tried compiling sdl3 with this change?

[Emmankoko]

Just doublecheck that none of these are #defined in importc.h

noted !

[Emmankoko]

Looks good! Have you tried compiling sdl3 with this change?

joe@Emmanuels-MacBook-Pro dmd % ./generated/osx/release/64/dmd see.d -L-lSDL3 -P-I/usr/local/opt/sdl3/include/SDL3/ zup.c
joe@Emmanuels-MacBook-Pro dmd % ./generated/osx/release/64/dmd see.d -L-lSDL3 -P-I/usr/local/opt/sdl3/include/SDL3/ zup.c
joe@Emmanuels-MacBook-Pro dmd % 

locally testing them. sdl compiles now on macOS

[thewilsonator]

Is this good to go?