Add stub for InvalidateNLSCache.

dlls/kernel/kernel32.spec

@@ -561,7 +561,7 @@
 @ stdcall InterlockedDecrement(ptr)
 @ stdcall InterlockedExchange(ptr long)
 @ stdcall InterlockedIncrement(ptr)
-@ stub InvalidateNLSCache
+@ stdcall InvalidateNLSCache()
 @ stdcall IsBadCodePtr(ptr)
 @ stdcall IsBadHugeReadPtr(ptr long)
 @ stdcall IsBadHugeWritePtr(ptr long)

dlls/kernel/locale.c

@@ -1040,3 +1040,12 @@ BOOL EnumSystemLanguageGroupsW(
   SetLastError( ERROR_INVALID_PARAMETER );
   return FALSE;
 }
+
+/******************************************************************************
+ *           InvalidateNLSCache           (KERNEL32.@)
+ */
+BOOL WINAPI InvalidateNLSCache(void)
+{
+  FIXME("stub\n");
+  return FALSE;
+}