mountmgr.sys: Ensure unixlib function tables and enum stay in sync.

dlls/mountmgr.sys/unixlib.c

@@ -586,3 +586,5 @@ const unixlib_entry_t __wine_unix_call_funcs[] =
     delete_credential,
     enumerate_credentials,
 };
+
+C_ASSERT( ARRAYSIZE(__wine_unix_call_funcs) == unix_funcs_count );

dlls/mountmgr.sys/unixlib.h

@@ -172,6 +172,7 @@ enum mountmgr_funcs
     unix_write_credential,
     unix_delete_credential,
     unix_enumerate_credentials,
+    unix_funcs_count
 };
 
 #define MOUNTMGR_CALL( func, params ) WINE_UNIX_CALL( unix_ ## func, params )