getopt: do not needlessly use static structure.

Reorder structure members and change some of them into smallints
to reduce bss and text:
    text    data    bss   dec     hex filename
-   2403    12       40   2455    997 libc/unistd/getopt.o
+   2252    12        0   2264    8d8 libc/unistd/getopt.o

libc/unistd/getopt.c

@@ -162,10 +162,6 @@ int opterr = 1;
 
 int optopt = '?';
 
-/* Keep a global copy of all internal members of getopt_data.  */
-
-static struct _getopt_data getopt_data;
-
 
 #ifndef __GNU_LIBRARY__
 
@@ -1158,7 +1154,9 @@ _getopt_internal (int argc, char *const *argv, const char *optstring,
 		  const struct option *longopts, int *longind, int long_only)
 {
   int result;
+  struct _getopt_data getopt_data;
 
+  memset(&getopt_data, 0, sizeof(getopt_data));
   getopt_data.optind = optind;
   getopt_data.opterr = opterr;
 

libc/unistd/getopt_int.h

@@ -30,29 +30,29 @@ extern int _getopt_internal (int ___argc, char *const *___argv,
 /* Reentrant versions which can handle parsing multiple argument
    vectors at the same time.  */
 
+enum
+  {
+    REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
+  };
+
 /* Data type for reentrant functions.  */
 struct _getopt_data
 {
   /* These have exactly the same meaning as the corresponding global
      variables, except that they are used for the reentrant
      versions of getopt.  */
+  char *optarg;
   int optind;
   int opterr;
   int optopt;
-  char *optarg;
 
   /* Internal members.  */
 
   /* True if the internal members have been initialized.  */
-  int __initialized;
-
-  /* The next char to be scanned in the option-element
-     in which the last option character we returned was found.
-     This allows us to pick up the scan where we left off.
+  smallint __initialized;
 
-     If this is zero, or a null string, it means resume the scan
-     by advancing to the next ARGV-element.  */
-  char *__nextchar;
+  /* If the POSIXLY_CORRECT environment variable is set.  */
+  smallint __posixly_correct;
 
   /* Describe how to deal with options that follow non-option ARGV-elements.
 
@@ -82,15 +82,15 @@ struct _getopt_data
      The special argument `--' forces an end of option-scanning regardless
      of the value of `ordering'.  In the case of RETURN_IN_ORDER, only
      `--' can cause `getopt' to return -1 with `optind' != ARGC.  */
+  smallint __ordering;
 
-  enum
-    {
-      REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
-    } __ordering;
-
-  /* If the POSIXLY_CORRECT environment variable is set.  */
-  int __posixly_correct;
+  /* The next char to be scanned in the option-element
+     in which the last option character we returned was found.
+     This allows us to pick up the scan where we left off.
 
+     If this is zero, or a null string, it means resume the scan
+     by advancing to the next ARGV-element.  */
+  char *__nextchar;
 
   /* Handle permutation of arguments.  */