Xpra: Ticket #2401: automate building and updating libpdfium

The PKGBUILD exists: https://github.com/msys2/MINGW-packages/tree/master/mingw-w64-pdfium-git but it builds from git sources, so we need to use makepkg to get it installed. Then we should update it fairly regularly with bug fixes.

Mon, 02 Sep 2019 15:01:13 GMT - Antoine Martin: status changed

Added a message in r23683.

Original ticket: #1230

Mon, 28 Dec 2020 15:25:41 GMT - Antoine Martin: status, milestone changed; resolution set

We now use pdfium-binaries : ticket:2470#comment:12

Sat, 23 Jan 2021 05:50:18 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2401