difftests: don't cfg out the shader

Author: Firestar99

tests/difftests/tests/simple-compute/simple-compute-rust/Cargo.toml

@@ -12,7 +12,6 @@ crate-type = ["dylib"]
 [dependencies]
 
 # GPU deps
-[target.'cfg(target_arch = "spirv")'.dependencies]
 spirv-std.workspace = true
 
 # CPU deps

tests/difftests/tests/simple-compute/simple-compute-rust/src/lib.rs

@@ -1,4 +1,3 @@
-#![cfg(target_arch = "spirv")]
 #![no_std]
 
 use spirv_std::spirv;