atl: Change storage class of dll_count to static.

dlls/atl/registrar.c

diff --git a/dlls/atl/registrar.c b/dlls/atl/registrar.c
index 11d266f..2869e49 100644
--- a/dlls/atl/registrar.c
+++ b/dlls/atl/registrar.c
@@ -38,7 +38,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(atl);
 
-LONG dll_count = 0;
+static LONG dll_count;
 
 /**************************************************************
  * ATLRegistrar implementation