Fix libarchive permission extraction

Hackish fix to ensure libarchive extracts files and dirs with the right
permissions.  For some reason extracting /tmp on install wasn't handled properly
by librachive, so an explicit chmod will fix this.

Signed-off-by: Aaron Griffin <aaronmgriffin@gmail.com>

lib/libalpm/add.c

@@ -700,6 +700,8 @@ int _alpm_add_commit(pmtrans_t *trans, pmdb_t *db)
 						_alpm_log(PM_LOG_ERROR, _("could not extract %s (%s)"), filename, strerror(errno));
 						alpm_logaction(_("error: could not extract %s (%s)"), filename, strerror(errno));
 						errors++;
+					} else {
+						chmod(filename, archive_entry_mode(entry));
 					}
 
 					/* calculate an hash if this is in newpkg's backup */