mshtml: Declare a variable static

[Andrew Talbot]

Changelog:
    mshtml: Declare a compound static.

diff -urN a/dlls/mshtml/nsembed.c b/dlls/mshtml/nsembed.c
--- a/dlls/mshtml/nsembed.c	2006-12-22 14:43:36.000000000 +0000
+++ b/dlls/mshtml/nsembed.c	2007-01-11 14:43:17.000000000 +0000
@@ -1393,7 +1393,7 @@
 
 #undef NSWEAKREF_THIS
 
-const nsISupportsWeakReferenceVtbl nsSupportsWeakReferenceVtbl = {
+static const nsISupportsWeakReferenceVtbl nsSupportsWeakReferenceVtbl = {
     nsSupportsWeakReference_QueryInterface,
     nsSupportsWeakReference_AddRef,
     nsSupportsWeakReference_Release,