[Xcb] ask for directory of xcb-proto.pc

[Matt Turner]

On Wed, Mar 22, 2023 at 3:52 AM wangmy at fujitsu.com <wangmy at fujitsu.com> wrote:
>
> xcb-proto.pc has been placed under /usr/share, regardless of architecture.
> However, this file contains the following contents:
> pythondir=${pc_sysrootdir}${libdir}/python3.11/site-packages
> It needs to find python related content under libdir, which is architecture related.
> Therefore, it seems not possible to make xcb-proto.pc architecture independent.


I left a larger comment here:
https://gitlab.freedesktop.org/xorg/proto/xcbproto/-/merge_requests/30#note_1834213

But in short, I don't understand how/why pythondir is defined in terms
of libdir.