[common] remove unused vector_math.h fluff (#4333)

Signed-off-by: lizzie <lizzie@eden-emu.dev>

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
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-------------------

We don't use half of this file for anything -- it's dead code
also the NEON intrinsic replacements suck -- we are not beating GLM (plus we use registers for decomposition instead of using vec regs like everyone else does, so the "optimizations" dont matter)

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4333
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: Maufeat <sahyno1996@gmail.com>

src/common/CMakeLists.txt

@@ -89,7 +89,6 @@ add_library(
     param_package.h
     parent_of_member.h
     point.h
-    quaternion.h
     range_map.h
     range_mutex.h
     range_sets.h