Only run cg_gcc tests on linux x86_64

Author: GuillaumeGomez

src/bootstrap/src/core/build_steps/test.rs

@@ -3122,11 +3122,6 @@ impl Step for CodegenGCC {
 
         let triple = run.target.triple;
         let target_supported = if triple.contains("linux") {
-            triple.contains("x86_64")
-                || triple.contains("aarch64")
-                || triple.contains("s390x")
-                || triple.contains("riscv64gc")
-        } else if triple.contains("darwin") || triple.contains("windows") {
             triple.contains("x86_64")
         } else {
             false