[libc] [llvm] [libc] Remove some unused includes from headers under src/math/generic. (PR #121632)

[Alexey Samsonov via llvm-commits]

vonosmas wrote:

Probably no - this was a one-off run on some headers when a Bazel build broke after some unrelated changes and I noticed the extra include. Even then, the results of include-cleaner can't be applied as-is, because it wasn't able to understand some of the header uses in code that was ifdef-ed out. Leaving to you how much we want to invest in a continuous process / checks.

https://github.com/llvm/llvm-project/pull/121632