libarchive: Define _XOPEN_SOURCE for get(pwu|grg)id_r

The commit "Fixed a few of the SunOS build errors in libarchive" changed
the call to these functions to use the old signatures.  Instead we now
define _XOPEN_SOURCE to get the improved modern signatures.

Utilities/cmlibarchive/libarchive/archive_read_disk_set_standard_lookup.c

@@ -23,6 +23,10 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef _XOPEN_SOURCE
+# define _XOPEN_SOURCE 500 /* getpwuid_r and getgrgid_r signatures */
+#endif
+
 #include "archive_platform.h"
 __FBSDID("$FreeBSD$");
 
@@ -186,7 +190,7 @@ static const char *
 lookup_uname_helper(struct name_cache *cache, id_t id)
 {
     struct passwd   pwent, *result;
-    int r = 0;
+    int r;
 
     if (cache->buff_size == 0) {
         cache->buff_size = 256;
@@ -195,12 +199,8 @@ lookup_uname_helper(struct name_cache *cache, id_t id)
     if (cache->buff == NULL)
         return (NULL);
     for (;;) {
-#if defined(__sun)
-        result = getpwuid_r((uid_t)id, &pwent, cache->buff, cache->buff_size);
-#else
         r = getpwuid_r((uid_t)id, &pwent,
                    cache->buff, cache->buff_size, &result);
-#endif
         if (r == 0)
             break;
         if (r != ERANGE)
@@ -238,7 +238,7 @@ static const char *
 lookup_gname_helper(struct name_cache *cache, id_t id)
 {
     struct group    grent, *result;
-    int r = 0;
+    int r;
 
     if (cache->buff_size == 0) {
         cache->buff_size = 256;
@@ -247,12 +247,8 @@ lookup_gname_helper(struct name_cache *cache, id_t id)
     if (cache->buff == NULL)
         return (NULL);
     for (;;) {
-#if defined(__sun)
-        result = getgrgid_r((gid_t)id, &grent, cache->buff, cache->buff_size);
-#else
         r = getgrgid_r((gid_t)id, &grent,
                    cache->buff, cache->buff_size, &result);
-#endif
         if (r == 0)
             break;
         if (r != ERANGE)

Utilities/cmlibarchive/libarchive/archive_write_disk_set_standard_lookup.c

@@ -23,6 +23,10 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef _XOPEN_SOURCE
+# define _XOPEN_SOURCE 500 /* getpwuid_r and getgrgid_r signatures */
+#endif
+
 #include "archive_platform.h"
 __FBSDID("$FreeBSD: src/lib/libarchive/archive_write_disk_set_standard_lookup.c,v 1.4 2007/05/29 01:00:19 kientzle Exp $");
 
@@ -122,14 +126,10 @@ lookup_gid(void *private_data, const char *gname, gid_t gid)
         size_t bufsize = 128;
         char *buffer = _buffer;
         struct group    grent, *result;
-        int r = 0;
+        int r;
 
         for (;;) {
-#if defined(__sun)
-            result = getgrnam_r(gname, &grent, buffer, bufsize);
-#else
             r = getgrnam_r(gname, &grent, buffer, bufsize, &result);
-#endif
             if (r == 0)
                 break;
             if (r != ERANGE)
@@ -185,14 +185,10 @@ lookup_uid(void *private_data, const char *uname, uid_t uid)
         size_t bufsize = 128;
         char *buffer = _buffer;
         struct passwd   pwent, *result;
-        int r = 0;
+        int r;
 
         for (;;) {
-#if defined(__sun)
-            result = getpwnam_r(uname, &pwent, buffer, bufsize);
-#else
             r = getpwnam_r(uname, &pwent, buffer, bufsize, &result);
-#endif
             if (r == 0)
                 break;
             if (r != ERANGE)