[poppler] Poppler 21.04.0 released

[Albert Astals Cid]

Available from
http://poppler.freedesktop.org/poppler-21.04.0.tar.xz

The tarball is signed at http://poppler.freedesktop.org/poppler-21.04.0.tarxz.sig with my key
http://hkps.pool.sks-keyservers.net/pks/lookup?op=get&search=0xCA262C6C83DE4D2FB28A332A3A6A4DB839EAA6D7

Release 21.04.0
core:
 * Hide symbols by default
 * TextSelectionDumper: fix word order for RTL text
 * Fix rendering of text in some files. Issue #1052
 * Implement rendering of Masks of Image subtype. Issue #1058
 * Forms: fix unclicking standalone form buttons. Issue #1034

glib:
 * Expose more fields from MediaRendition in PopplerMedia
 * Use stock glib macro to define boxed type
 * Remove incorrecly used volatile from enum type registration code

qt5:
 * Fix crash in files with malformed signatures
 * Fix memory leak when QImage constructor "fails"

qt6:
 * Fix crash in files with malformed signatures
 * Fix memory leak when QImage constructor "fails"

utils:
 * pdfsig: New paragraph for "-sign" in manpage
 * pdfimages: Do not assert in "too big images". Issue #1061

build system:
 * Require cmake >= 3.10
 * Require Qt 5 >= 5.9
 * Require glib >= 2.56
 * Require gtk 3 >= 3.22
 * Require gdk-pixbuf >= 2.36

This release was brought to you by Albert Astals Cid, Christian Persch, Clément Pit-Claudel, Marek Kasik, Nelson Benítez León, Steve Rosenhamer and everyone else that filed bugs or helped with code reviews :)

Testing, patches and bug reports welcome.

Cheers,
  Albert