Add global C flags to compile_commands

This solves linter warnings in editor by adding flags to ignore errors
we don't care about. This also means that compile_commands.json is
closer to the flags we actually use for compilation.

Test: Checked generated compile_commands for new flags.

Change-Id: Id583da6eb5151a9baa9a47771f5f937c88bc43f7

cc/compdb.go

@@ -164,6 +164,7 @@ func getArguments(src android.Path, ctx android.SingletonContext, ccModule *Modu
 		args = append(args, expandAllVars(ctx, ccModule.flags.Local.ConlyFlags)...)
 	}
 	args = append(args, expandAllVars(ctx, ccModule.flags.SystemIncludeFlags)...)
+	args = append(args, expandAllVars(ctx, ccModule.flags.NoOverrideFlags)...)
 	args = append(args, src.String())
 	return args
 }