Can we make libm optional?

[arthurgreef]

Hi I'd like to use your library with a Solana program. The program fails when libm is not optional. Can we make the dependency optional? Thanks.

[dependencies.libm]
optional = true
version = "0.2.1"

[dignifiedquire]

This only works if we have fallbacks for the functionality that libm provides in that case, which would be greatr to hav e