Review feedback.

Author: cfallin

crates/wasmtime/src/config.rs

@@ -2236,11 +2236,9 @@ impl Config {
             bail!("wmemcheck (memory checker) was requested but is not enabled in this build");
         }
 
-        #[cfg(feature = "gc")]
-        if self.enabled_features.contains(WasmFeatures::EXCEPTIONS)
-            && self.disabled_features.contains(WasmFeatures::GC)
-        {
-            bail!("exceptions support requires garbage collection (GC) to be enabled");
+        #[cfg(not(feature = "gc"))]
+        if self.enabled_features.contains(WasmFeatures::EXCEPTIONS) {
+            bail!("exceptions support requires garbage collection (GC) to be enabled in the build");
         }
 
         let mut tunables = Tunables::default_for_target(&self.compiler_target())?;