maint: exclude tests from the set_program_name syntax-check

* .x-sc_program_name: Exclude all current and future
c files in gl/tests from this check
* gl/tests/test-di-set.c: Remove the hack to work around
the set_program_name syntax-check
* gl/tests/test-ino-map.c: Likewise
* gl/tests/test-rand-isaac.c: Likewise

.x-sc_program_name

@@ -1,4 +1,3 @@
 gl/lib/randint.c
 lib/euidaccess-stat.c
-gl/tests/test-mbsalign.c
-gl/tests/test-fadvise.c
+gl/tests/.*\.c

gl/tests/test-di-set.c

@@ -39,7 +39,6 @@
 int
 main (void)
 {
-  /* set_program_name (argv[0]); placate overzealous "syntax-check" test.  */
   struct di_set *dis = di_set_alloc ();
   ASSERT (dis);
 

gl/tests/test-ino-map.c

@@ -39,7 +39,6 @@
 int
 main ()
 {
-  /* set_program_name (argv[0]); placate overzealous "syntax-check" test.  */
   enum { INO_MAP_INIT = 123 };
   struct ino_map *ino_map = ino_map_alloc (INO_MAP_INIT);
   ASSERT (ino_map != NULL);

gl/tests/test-rand-isaac.c

@@ -576,7 +576,6 @@ static isaac_word const expected[2][ISAAC_WORDS] =
 int
 main (int argc, char **argv)
 {
-  /* set_program_name (argv[0]); placate overzealous "syntax-check" test.  */
   unsigned int i;
   isaac_word r[ISAAC_WORDS];
   int iterations;