fix: restore dconfig_meta_files macro for DTK5 compatibility

1. Reverted the conditional logic in dtkcore.cmake to install
DtkDConfigMacros.cmake for DTK5 builds
2. The macro `dconfig_meta_files` was removed in DTK6 but is still
required for DTK5 compatibility
3. Changed condition from `if (NOT DTK5)` to `if (DTK5)` to ensure the
deprecated macro file is installed when building for DTK5
4. This preserves backward compatibility for projects that rely on the
`dconfig_meta_files` function in DTK5 environments

Log: Restored compatibility with DTK5 projects using dconfig_meta_files
macro

Influence:
1. Test building with DTK5 enabled to verify DtkDConfigMacros.cmake
is installed
2. Verify that the `dconfig_meta_files` function is available in DTK5
builds
3. Test building with DTK6 to ensure the deprecated macro is not
installed
4. Check that existing DTK5 projects can successfully use the
dconfig_meta_files macro
5. Verify CMake installation paths contain the correct macro files for
each DTK version

fix: 恢复 dconfig_meta_files 宏以支持 DTK5 兼容性

1. 在 dtkcore.cmake 中恢复条件逻辑，为 DTK5 构建安装
DtkDConfigMacros.cmake
2. `dconfig_meta_files` 宏在 DTK6 中被移除，但在 DTK5 环境中仍然需要
3. 将条件从 `if (NOT DTK5)` 改为 `if (DTK5)`，确保在构建 DTK5 时安装已弃
用的宏文件
4. 这为依赖 DTK5 环境中 `dconfig_meta_files` 函数的项目保留了向后兼容性

Log: 恢复与使用 dconfig_meta_files 宏的 DTK5 项目的兼容性

Influence:
1. 测试启用 DTK5 的构建，验证 DtkDConfigMacros.cmake 是否正确安装
2. 验证 `dconfig_meta_files` 函数在 DTK5 构建中是否可用
3. 测试使用 DTK6 构建，确保不安装已弃用的宏
4. 检查现有 DTK5 项目能否成功使用 dconfig_meta_files 宏
5. 验证 CMake 安装路径是否包含适用于各 DTK 版本的正确宏文件

Author: 18202781743

dtkcore.cmake

@@ -94,7 +94,7 @@ install(FILES cmake/DtkTools/DtkDBusMacros.cmake
 install(FILES ${CMAKE_SOURCE_DIR}/cmake/DtkTools/DtkDConfigMacros.cmake
         DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/Dtk${DTK_NAME_SUFFIX}Tools")
 
-if (NOT DTK5)
+if (DTK5)
     set(DCONFIG_DEPRECATED_FUNCS [=[
 # deprecated since dtk6
 function(dconfig_meta_files)