Reference the test case "packs" to fix warnings

Put the various atf_tc_pack_t variables generated by ATF_TC to use in
the macros_h_test.c file so that we prevent some build warnings (and
thus some build errors) with clang and -Wunused.

Obtained from:  atf (git 70126d013db25c72539803f19f7e00baddacdf51)

contrib/atf/NEWS

@@ -14,6 +14,9 @@ the 'tools' directory for your own consumption.
 * Removed the deprecated tools.  This includes atf-config, atf-report,
   atf-run and atf-version.
 
+* Issue #8: Fixed atf-c/macros_test:use test failures spotted by the clang
+  that ships with FreeBSD 11.0-CURRENT.
+
 
 Changes in version 0.19
 ***********************

contrib/atf/atf-c/macros_h_test.c

@@ -87,17 +87,20 @@ ATF_TC(TEST_MACRO_1);
 ATF_TC_HEAD(TEST_MACRO_1, tc) { if (tc != NULL) {} }
 ATF_TC_BODY(TEST_MACRO_1, tc) { if (tc != NULL) {} }
 atf_tc_t *test_name_1 = &ATF_TC_NAME(TEST_MACRO_1);
+atf_tc_pack_t *test_pack_1 = &ATF_TC_PACK_NAME(TEST_MACRO_1);
 void (*head_1)(atf_tc_t *) = ATF_TC_HEAD_NAME(TEST_MACRO_1);
 void (*body_1)(const atf_tc_t *) = ATF_TC_BODY_NAME(TEST_MACRO_1);
 ATF_TC_WITH_CLEANUP(TEST_MACRO_2);
 ATF_TC_HEAD(TEST_MACRO_2, tc) { if (tc != NULL) {} }
 ATF_TC_BODY(TEST_MACRO_2, tc) { if (tc != NULL) {} }
 ATF_TC_CLEANUP(TEST_MACRO_2, tc) { if (tc != NULL) {} }
 atf_tc_t *test_name_2 = &ATF_TC_NAME(TEST_MACRO_2);
+atf_tc_pack_t *test_pack_2 = &ATF_TC_PACK_NAME(TEST_MACRO_2);
 void (*head_2)(atf_tc_t *) = ATF_TC_HEAD_NAME(TEST_MACRO_2);
 void (*body_2)(const atf_tc_t *) = ATF_TC_BODY_NAME(TEST_MACRO_2);
 void (*cleanup_2)(const atf_tc_t *) = ATF_TC_CLEANUP_NAME(TEST_MACRO_2);
 ATF_TC_WITHOUT_HEAD(TEST_MACRO_3);
 ATF_TC_BODY(TEST_MACRO_3, tc) { if (tc != NULL) {} }
 atf_tc_t *test_name_3 = &ATF_TC_NAME(TEST_MACRO_3);
+atf_tc_pack_t *test_pack_3 = &ATF_TC_PACK_NAME(TEST_MACRO_3);
 void (*body_3)(const atf_tc_t *) = ATF_TC_BODY_NAME(TEST_MACRO_3);