gdiplus: Add GdipGetPenCompoundCount implementation.

dlls/gdiplus/pen.c

@@ -528,12 +528,12 @@ GpStatus WINGDIPAPI GdipSetPenColor(GpPen *pen, ARGB argb)
 
 GpStatus WINGDIPAPI GdipGetPenCompoundCount(GpPen *pen, INT *count)
 {
-    FIXME("(%p, %p): stub\n", pen, count);
+    TRACE("(%p, %p)\n", pen, count);
 
     if (!pen || !count)
         return InvalidParameter;
-
-    return NotImplemented;
+    *count = pen->compound_array_size;
+    return Ok;
 }
 
 GpStatus WINGDIPAPI GdipSetPenCompoundArray(GpPen *pen, GDIPCONST REAL *compoundarray,

dlls/gdiplus/tests/pen.c

@@ -370,10 +370,9 @@ static void test_compoundarray(void)
 
     count = 10;
     status = GdipGetPenCompoundCount(pen, &count);
-todo_wine {
     expect(Ok, status);
     ok(count == 0, "Unexpected compound count %d\n", count);
-}
+
     status = GdipSetPenCompoundArray(pen, NULL, 0);
     expect(InvalidParameter, status);
     status = GdipSetPenCompoundArray(pen, NULL, 4);