wkhtmltopdf: add qtxmlpatterns dependency

[notriddle]

Motivation for this change

building '/nix/store/7n2cag47gl93wp3f0mv7fiq3dybq2a6l-wkhtmltopdf-0.12.5.drv'...
unpacking sources
unpacking source archive /nix/store/lv2zcapqqn1kjlc616ljap1ddlc2lvx8-source
source root is source
patching sources
configuring
Info: creating stash file /tmp/nix-build-wkhtmltopdf-0.12.5.drv-0/source/.qmake.stash
building
build flags: -j4 -l4 SHELL=/nix/store/i82x3x0yiijkgyqkzh8ni87gspas0f48-bash-4.4-p23/bin/bash
cd src/lib/ && ( test -e Makefile || /nix/store/334ck8czp3jhfy0ppy55sb6dxf7yxsdv-qtbase-5.12.0-dev/bin/qmake -o Makefile /tmp/nix-build-wkhtmltopdf-0.12.5.drv-0/source/src/lib/lib.pro INSTALLBASE=/nix/store/rc8z502xa3w0n2qm2vmr5d3l73v1lyyd-wkhtmltopdf-0.12.5 ) && make -f Makefile
Project ERROR: Unknown module(s) in QT: xmlpatterns
make: *** [Makefile:47: sub-src-lib-make_first-ordered] Error 3
builder for '/nix/store/7n2cag47gl93wp3f0mv7fiq3dybq2a6l-wkhtmltopdf-0.12.5.drv' failed with exit code 2

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.

---

[veprbl]

@GrahamcOfBorg build wkhtmltopdf

[veprbl]

Fixes 5fc5f15 ('qtxmlpatterns: fix dependency with qtdeclarative')

[layus]

Just a small nitpick: this does not at all fit CONTRIBUTING.md which is all about good commit messages and good commit titles. The format used in the new PR title should go in the commit title instead.

Nice catch by the way ;-).