linux-user: arg_table need not have global scope

Declare arg_table to be "static const", and adjust the two users
to also be const.

Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
diff --git a/linux-user/main.c b/linux-user/main.c
index 7dea084..b1c228a 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -3222,7 +3222,7 @@
     const char *help;
 };
 
-struct qemu_argument arg_table[] = {
+static const struct qemu_argument arg_table[] = {
     {"h",          "",                 false, handle_arg_help,
      "",           "print this help"},
     {"g",          "QEMU_GDB",         true,  handle_arg_gdb,
@@ -3264,7 +3264,7 @@
 
 static void usage(void)
 {
-    struct qemu_argument *arginfo;
+    const struct qemu_argument *arginfo;
     int maxarglen;
     int maxenvlen;
 
@@ -3330,7 +3330,7 @@
 {
     const char *r;
     int optind;
-    struct qemu_argument *arginfo;
+    const struct qemu_argument *arginfo;
 
     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
         if (arginfo->env == NULL) {