Change the implementation of supports_parallel to signal tha cg_gcc is not thread safe.

Author: FractalFir

src/lib.rs

@@ -289,6 +289,10 @@ fn new_context<'gcc, 'tcx>(tcx: TyCtxt<'tcx>) -> Context<'gcc> {
 }
 
 impl ExtraBackendMethods for GccCodegenBackend {
+    fn supports_parallel(&self) -> bool {
+        false
+    }
+    
     fn codegen_allocator(
         &self,
         tcx: TyCtxt<'_>,