c++: Add new test [PR59978]

Fixed in r224162.  That came without a test so adding this one.
Previously, we issued a bogus "too few arguments to function" error.

gcc/testsuite/ChangeLog:

	PR c++/59978
	* g++.dg/cpp0x/vt-59978.C: New test.

gcc/testsuite/g++.dg/cpp0x/vt-59978.C

@@ -0,0 +1,16 @@
+// PR c++/59978
+// { dg-do compile { target c++11 } }
+
+static void testFunc(int i1, int i2) {
+    (void)i1;
+    (void)i2;
+}
+
+template <int... Ints> void wrapper() {
+    testFunc(Ints...);
+}
+
+int main()
+{
+    wrapper<1, 2>();
+}