msctf: Declare some variables static

[Andrew Talbot]

Changelog:
    msctf: Declare some variables static.

diff --git a/dlls/msctf/msctf.c b/dlls/msctf/msctf.c
index 76ed99d..254444b 100644
--- a/dlls/msctf/msctf.c
+++ b/dlls/msctf/msctf.c
@@ -39,9 +39,9 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(msctf);
 
-LONG MSCTF_refCount = 0;
+static LONG MSCTF_refCount;
 
-HINSTANCE MSCTF_hinstance = 0;
+static HINSTANCE MSCTF_hinstance;
 
 typedef HRESULT (*LPFNCONSTRUCTOR)(IUnknown *pUnkOuter, IUnknown **ppvOut);