dwrite: Ensure unixlib function tables and enum stay in sync.

dlls/dwrite/freetype.c

@@ -815,6 +815,8 @@ const unixlib_entry_t __wine_unix_call_funcs[] =
     get_design_glyph_metrics,
 };
 
+C_ASSERT( ARRAYSIZE(__wine_unix_call_funcs) == unix_funcs_count );
+
 #ifdef _WIN64
 
 typedef ULONG PTR32;
@@ -1041,4 +1043,6 @@ const unixlib_entry_t __wine_unix_call_wow64_funcs[] =
     wow64_get_design_glyph_metrics,
 };
 
+C_ASSERT( ARRAYSIZE(__wine_unix_call_wow64_funcs) == unix_funcs_count );
+
 #endif  /* _WIN64 */

dlls/dwrite/unixlib.h

@@ -107,6 +107,7 @@ enum font_backend_funcs
     unix_get_glyph_bbox,
     unix_get_glyph_bitmap,
     unix_get_design_glyph_metrics,
+    unix_funcs_count,
 };
 
 #define UNIX_CALL( func, params ) WINE_UNIX_CALL( unix_ ## func, params )