fix: make fontconfig work again

Author: wineee

src/lcui_fonts.c

@@ -62,7 +62,7 @@ static void lcui_fc_fonts_init(void)
 
         for (i = 0; i < sizeof(fonts) / sizeof(char *); ++i) {
                 path = pd_font_library_get_font_path(fonts[i]);
-                id = pd_font_library_load_file(path);
+                pd_font_library_load_file(path);
                 free(path);
                 // TODO: 使用系统已设置的默认字体
                 if (!has_default) {

xmake.lua

@@ -79,6 +79,9 @@ target("lcui")
     elseif is_plat("windows") then
         add_defines("LCUI_DLL_EXPORT")
     end
+    if has_package("fontconfig") then
+        add_defines("HAVE_FONTCONFIG")
+    end
     add_configfiles("src/config.h.in")
     set_configdir("include/LCUI")
     add_deps(