[clang] [WebAssembly] Remove wasm-features.c test (PR #80900)

[Heejin Ahn via cfe-commits]

aheejin wrote:

Sorry, I was confused. Enabling individual features with `-mfeature-name` to `clang` adds `-target-feature` `feature-name` to the `clang-14` as intended. Only the `-mcpu` tests were not working as intended. I think I need to only delete the parts that test CPUs instead.

https://github.com/llvm/llvm-project/pull/80900