Minor fixes.

* src/names.c: Include argp.h
* tests/testsuite.at (AT_XATTRS_UTILS_PREREQ)
(AT_SELINUX_UTILS_PREREQ,AT_ACLS_UTILS_PREREQ)
(AT_CAPABILITIES_UTILS_PREREQ)
(AT_XATTRS_PREREQ,AT_SELINUX_PREREQ)
(AT_ACLS_PREREQ): Use POSIX-compatible syntax for
mktemp.
* tests/incr08.at: Fix find usage.

src/names.c

@@ -22,6 +22,7 @@
 #include <hash.h>
 #include <quotearg.h>
 #include <wordsplit.h>
+#include <argp.h>
 
 #include "common.h"