fix obscure macOS issue where the Apple locale is set to something setlocale(3) doesn't understand; don't source .bash_logout if the shell is running setuid; fix for macOS issue with pipe size throttling and here-documents

shell.c

@@ -211,6 +211,9 @@ static int act_like_sh;
 /* Non-zero if we have already expanded and sourced $ENV. */
 static int sourced_env;
 
+/* Non-zero if we have already sourced ~/.bash_logout. */
+static int sourced_logout;
+
 /* Is this shell running setuid? */
 static int running_setuid;
 
@@ -1250,6 +1253,19 @@ run_startup_files (void)
 #endif
 }
 
+void
+bash_logout (void)
+{
+  /* Run our `~/.bash_logout' file if it exists, and this is a login shell. */
+  if (login_shell && sourced_logout++ == 0 && subshell_environment == 0 && running_setuid == 0)
+    {
+      maybe_execute_file ("~/.bash_logout", 1);
+#ifdef SYS_BASH_LOGOUT
+      maybe_execute_file (SYS_BASH_LOGOUT, 1);
+#endif
+    }
+}
+
 #if defined (RESTRICTED_SHELL)
 /* Return 1 if the shell should be a restricted one based on NAME or the
    value of `restricted'.  Don't actually do anything, just return a