Use the provided CMake file to build pugixml.

[mgautierfr]

Pugixml has a Cmake build system who generate a pkg-config file.
We do not need a custom meson file.

See kiwix/libkiwix#49

[kelson42]

@mgautierfr Is that still a topic?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be now be reviewed manually. Thank you for your contributions.

[kelson42]

@mgautierfr We use version 1.2 of pugixml which has been released 5 years ago. We shoukd use latest wich brings as well memory consumption and speed improvements.

[eli-schwartz]

pugixml 1.13 is also available in the Meson WrapDB. :) You can just add that instead, and stop maintaining your own patch for meson.build support.

[kelson42]

@mgautierfr Should we use Meson WrapDB or native tarball with CMake (my preference)?