[poppler] Poppler 21.03.0 released

[Albert Astals Cid]

Available from
http://poppler.freedesktop.org/poppler-21.03.0.tar.xz

The tarball is signed at http://poppler.freedesktop.org/poppler-21.03.0.tar.xz.sig with my key
http://hkps.pool.sks-keyservers.net/pks/lookup?op=get&search=0xCA262C6C83DE4D2FB28A332A3A6A4DB839EAA6D7

Release 21.03.0
core:
 * Fix parsing text in some broken pdf files. Issue #1040
 * Fix memory issue when using threads. Issue #1050
 * TextSelectionDumper: Fix getText() for space after word
 * Change signature of OutputDev:tilingPatternFill
 * Make PDFDocBuilder return a std::unique_ptr
 * Improve well formed check for shading functions
 * Fix leak in case of fread failing
 * Fix memory leak in broken file in JBIG2Stream::readGenericBitmap
 * PSOutputDev: Fix stack overflow in broken files

glib:
 * poppler_annot_free_text_get_callout_line: Fix wrong static cast
 * poppler-structure-element: fix memleak
 * Improve documentation
 * demo: keep same visual appearance between displayed and copied text

utils:
 * pdftotext: Add -cropbox option
 * pdftoppm: Add -progress option
 * pdftoppm: Fix rounding bug in computation of output bitmap size. Issue #927

qt6:
 * Add missing poppler-qt6.pc.cmake

This release was brought to you by Albert Astals Cid, Diogo Kollross, Evan Nemerson, Kyle Auble, Nelson Benítez León, Oliver Sander, William Bader and everyone else that filed bugs or helped with code reviews :)

Testing, patches and bug reports welcome.

Cheers,
  Albert