Remove some build-dependencies

Summary: We already have accurate build dependencies, and no reason for them to change based on the target.

Reviewed By: SamChou19815

Differential Revision: D73805175

fbshipit-source-id: 0b7912d409cb77bec82574186da31eb2dd531211

Author: ndmitchell

pyrefly/Cargo.toml

@@ -78,15 +78,8 @@ zstd = { version = "0.13", features = ["experimental", "zstdmt"] }
 which = "4.2.4"
 zstd = { version = "0.13", features = ["experimental", "zstdmt"] }
 
-[target.'cfg(not(target_arch = "wasm32"))'.build-dependencies]
-which = "4.2.4"
-zstd = { version = "0.13", features = ["experimental", "zstdmt"] }
-
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 zstd = "0.13"
 
-[target.'cfg(target_arch = "wasm32")'.build-dependencies]
-zstd = "0.13"
-
 [lints]
 rust = { unexpected_cfgs = { check-cfg = ["cfg(fbcode_build)"], level = "warn" } }