win32: update .def file for new API

API: gst_caps_is_strictly_equal()
diff --git a/win32/common/libgstreamer.def b/win32/common/libgstreamer.def
index 3c3084a..5f2847e 100644
--- a/win32/common/libgstreamer.def
+++ b/win32/common/libgstreamer.def
@@ -171,6 +171,7 @@
 	gst_caps_is_equal
 	gst_caps_is_equal_fixed
 	gst_caps_is_fixed
+	gst_caps_is_strictly_equal
 	gst_caps_is_subset
 	gst_caps_is_subset_structure
 	gst_caps_load_thyself