(feature request) mulsub functions

[beeverfeever]

Feature request for functions like the muladd functions but for subtraction instead.

So for example glm_vec3_subsub(a, b, d) would do d -= (a - b).

I'm not sure if there is a reason these aren't already functions in the library but I feel like they would be really useful (well they would be for me right now).

I would be happy to work on implementing them if it is something that is wanted.

[Recep Aslantas]

Hi @BeeverFeever,

Since we have _addadd, _addsub, _muladd we could also have _subsub 👍

I would be happy to work on implementing them if it is something that is wanted.

Sure, I'll wait a PR then, thanks