[poppler] Poppler 21.07.0 released

[Albert Astals Cid]

Available from
http://poppler.freedesktop.org/poppler-21.07.0.tar.xz

The tarball is signed at http://poppler.freedesktop.org/poppler-21.07.0.tar.xz.sig with my key
http://pgp.rediris.es:11371/pks/lookup?op=get&search=0xCA262C6C83DE4D2FB28A332A3A6A4DB839EAA6D7

Release 21.07.0
core:
 * JBIG2Stream: Do not consider a size-0 to be an error. Issue #535
 * PSOutputDev: fix off-by-one error for image masking in L1/L2 output. Issue #1088
 * CairoOutputDev: Fix memory leak on broken files
 * Minor code improvements

build system:
 * set C standard to 11 without extensions

This release was brought to you by Albert Astals Cid, Hubert Figuiere, Oliver Sander, Philipp Knechtges, Uli Schlachter and everyone else that filed bugs or helped with code reviews :)

Testing, patches and bug reports welcome.

Cheers,
  Albert