ash & wgpu runner: remove build script forwarding PROFILE env var

no longer necessary since d416b65

Author: Firestar99

examples/runners/ash/build.rs

@@ -8,13 +8,11 @@ fn main() -> Result<(), Box<dyn Error>> {
     println!("cargo:rerun-if-changed=build.rs");
     println!("cargo:rerun-if-env-changed=CARGO_CFG_TARGET_OS");
     println!("cargo:rerun-if-env-changed=CARGO_CFG_TARGET_ARCH");
-    // While OUT_DIR is set for both build.rs and compiling the crate, PROFILE is only set in
-    // build.rs. So, export it to crate compilation as well.
-    let profile = env::var("PROFILE").unwrap();
-    println!("cargo:rustc-env=PROFILE={profile}");
+
     if target_os != "android" && target_arch != "wasm32" {
         return Ok(());
     }
+    let profile = env::var("PROFILE").unwrap();
     let mut dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
     // Strip `$profile/build/*/out`.
     let ok = dir.ends_with("out")

examples/runners/wgpu/build.rs

@@ -236,17 +236,6 @@ pub fn main(
 
     #[cfg(not(any(target_os = "android", target_arch = "wasm32")))]
     {
-        // Hack: spirv_builder builds into a custom directory if running under cargo, to not
-        // deadlock, and the default target directory if not. However, packages like `proc-macro2`
-        // have different configurations when being built here vs. when building
-        // rustc_codegen_spirv normally, so we *want* to build into a separate target directory, to
-        // not have to rebuild half the crate graph every time we run. So, pretend we're running
-        // under cargo by setting these environment variables.
-        unsafe {
-            std::env::set_var("OUT_DIR", env!("OUT_DIR"));
-            std::env::set_var("PROFILE", env!("PROFILE"));
-        }
-
         if options.shader == RustGPUShader::Compute {
             return compute::start(&options);
         }