[poppler] Poppler 21.09.0 released

[Albert Astals Cid]

Available from
http://poppler.freedesktop.org/poppler-21.09.0.tar.xz

The tarball is signed at http://poppler.freedesktop.org/poppler-21.09.0.tar.xz.sig with my key
http://pgp.rediris.es:11371/pks/lookup?op=get&search=0xCA262C6C83DE4D2FB28A332A3A6A4DB839EAA6D7

Release 21.09.0:
core:
 * Splash: Massive spped improvement on files that use lots of save/restore (q/Q) operators
 * Correct decoding of signature properties Reason & Location when they are Unicode
 * Fix issues with malformed files
 * MSVC build fixes

build system:
 * Call cmake_minium_required() before project()
 * Always append to CMAKE_{C,CXX}_FLAGS_${CMAKE_BUILD_TYPE}
 * correctly forward user-provided flags to try_compile()

This release was brought to you by Albert Astals Cid, Alex Richardson, Even Rouault, Georgiy Sgibnev, Peter Williams, Thomas Freitag and everyone else that filed bugs or helped with code reviews :)

Testing, patches and bug reports welcome.

Cheers,
  Albert