[poppler] Poppler 0.68.0 released

[Albert Astals Cid]

Available from
http://poppler.freedesktop.org/poppler-0.68.0.tar.xz

Release 0.68.0
core:
 * Add Reason and Location to SignatureInfo. Bug #107299
 * Fix memory misuse on signature handling
 * Fix security issues found by oss-fuzz
 * Don't give a warning when Marked value is false. Bug #107430

qt5:
 * Add Reason and Location to SignatureInfo. Bug #107299

cpp:
 * Add rotation() to text_box. Bug #106562
 * Fix build with MSVC

utils:
 * pdftoppm: Add -jpegopt optimize option support
 * pdftocairo: Add -jpegopt optimize option support
 * pdftohtml: Add option to not round coordinates
 * pdftohtml: Fix possible crash. Bug #107316

build system:
 * Use OpenJpeg cmake config file instead of pkgconfig
 * Remove wchar_t- on MSVC

This release was brought to you by Albert Astals Cid, Aleksey Nikolaev, Chinmoy Ranjan Pradhan, Hannah von Reth, Martin Packman, Steven Boswell, Thibaut Brard and Zsombor Hollay-Horvath

Testing, patches and bug reports welcome.

Cheers,
  Albert