Make INIT operator optionnal for ARRAY & LIST.

tests/test-marray.c

@@ -31,6 +31,9 @@ ARRAY_DEF(array_mpz, testobj_t, TESTOBJ_OPLIST)
 END_COVERAGE
 #define ARRAY_UINT_OPLIST ARRAY_OPLIST(array_uint)
 
+// Array with the minimum number of methods.
+ARRAY_DEF(array_min_z, testobj_t, (INIT_SET(testobj_init_set), SET(testobj_set), CLEAR(testobj_clear)))
+
 static void test_uint(void)
 {
   array_uint_t v;