xrepo的cgal更新6.x后，低版本gcc无法编译低版本的cgal

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Xmake 版本

2.9.5

操作系统版本和架构

4.4.131-20200710.kylin.desktop-generic

描述问题

#5542 更新后导致低版本gcc无法编译，回退后可以，cgal版本指定为5.2.1

期待的结果

编译成功

工程配置

add_requires("cgal 5.2.1")

附加信息和错误日志

include/eigen3/Eigen/src/Core/util/Meta.h:504:25: error: ‘invoke_result’ in namespace ‘std’ does not name a template type
   typedef typename std::invoke_result<F, ArgTypes...>::type type1;

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Title: After the cgal of xrepo is updated to 6.x, the lower version of gcc cannot compile the lower version of cgal

Xmake version

2.9.5

Operating system version and architecture

4.4.131-20200710.kylin.desktop-generic

Describe the problem

#5542 After the update, the lower version of gcc cannot be compiled. After rolling back, it can be compiled. The cgal version is specified as 5.2.1.

Expected results

Compiled successfully

Project configuration

add_requires("cgal 5.2.1")

Additional information and error logs

include/eigen3/Eigen/src/Core/util/Meta.h:504:25: error: ‘invoke_result’ in namespace ‘std’ does not name a template type
   typedef typename std::invoke_result<F, ArgTypes...>::type type1;