Modify several tests to use test-skeleton.c

These tests were skipped by the use-test-skeleton conversion done in
commit 29955b5d because they did not have an `int main (void)'
declaration. Instead their `main' functions were declared with arguments
(i.e. argc, argv) even though they didn't use them.

Remove these arguments and include the test skeleton in these tests.

resolv/tst-aton.c

@@ -44,8 +44,8 @@ static struct tests
 };
 
 
-int
-main (int argc, char *argv[])
+static int
+do_test (void)
 {
   int result = 0;
   size_t cnt;
@@ -72,3 +72,6 @@ main (int argc, char *argv[])
 
   return result;
 }
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"