graphics/poppler: update to 0.76.1
From Changelog at https://poppler.freedesktop.org/releases.html :
* Make the mul tables be calculated at compile time with constexpr.
* splash: Fix compile with SPLASH_CMYK enabled
* Some typo fixing in error messages
* Fix regression in annotation handling
* Fix some typos in build system output and comments
(Only the first 15 lines of the commit message are shown above )
Mark webkit-gtk ports as depricated with the same date as webkit-gtk.
Disable webkit-gtk support if the port/plugin supports it.
Remove options for webkit-gtk using ports or if they don't have a
option, mark them deprecated with the same date as webkit-gtk.
Haskell and geany where skipped and will be handled by the maintainers.