qtchan: Fixes build from Qt upgrade.

[samueldr]

Uses an upstream fix.

Motivation for this change

Plowing through #45960 failures.

This is (with at least another failure) fallout from Qt 5.10 -> 5.11 from June.

It'll need cherry-picking to release-18.09

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)
• ✔️ Fits CONTRIBUTING.md.

#44047 wasn't an issue since this (wrongly?) wraps with qt plugin path...

---

[GrahamcOfBorg]

Success on x86_64-linux (full log)

Attempted: qtchan

Partial log (click to expand)

post-installation fixup
shrinking RPATHs of ELF executables and libraries in /nix/store/nybsdcwrdbi7krpvjw8jy3ilkl92d0vg-qtchan-0.100
shrinking /nix/store/nybsdcwrdbi7krpvjw8jy3ilkl92d0vg-qtchan-0.100/bin/.qtchan-wrapped
strip is /nix/store/h0lbngpv6ln56hjj59i6l77vxq25flbz-binutils-2.30/bin/strip
stripping (with command strip and flags -S) in /nix/store/nybsdcwrdbi7krpvjw8jy3ilkl92d0vg-qtchan-0.100/bin
patching script interpreter paths in /nix/store/nybsdcwrdbi7krpvjw8jy3ilkl92d0vg-qtchan-0.100
checking for references to /build in /nix/store/nybsdcwrdbi7krpvjw8jy3ilkl92d0vg-qtchan-0.100...
postPatchMkspecs
postPatchMkspecs
/nix/store/nybsdcwrdbi7krpvjw8jy3ilkl92d0vg-qtchan-0.100

[GrahamcOfBorg]

Success on aarch64-linux (full log)

Attempted: qtchan

Partial log (click to expand)

post-installation fixup
shrinking RPATHs of ELF executables and libraries in /nix/store/y20jkchcnkgqfa4ddhynb7rmm8wlcakm-qtchan-0.100
shrinking /nix/store/y20jkchcnkgqfa4ddhynb7rmm8wlcakm-qtchan-0.100/bin/.qtchan-wrapped
strip is /nix/store/y4ymnvgxygpq05h03kyzbj572zmh6zla-binutils-2.30/bin/strip
stripping (with command strip and flags -S) in /nix/store/y20jkchcnkgqfa4ddhynb7rmm8wlcakm-qtchan-0.100/bin
patching script interpreter paths in /nix/store/y20jkchcnkgqfa4ddhynb7rmm8wlcakm-qtchan-0.100
checking for references to /build in /nix/store/y20jkchcnkgqfa4ddhynb7rmm8wlcakm-qtchan-0.100...
postPatchMkspecs
postPatchMkspecs
/nix/store/y20jkchcnkgqfa4ddhynb7rmm8wlcakm-qtchan-0.100

[GrahamcOfBorg]

Success on x86_64-darwin (full log)

Attempted: qtchan

Partial log (click to expand)

clang++ -c -pipe -stdlib=libc++ -O2 -O3 -std=gnu++11 -Wall -W -fPIC -DQT_USE_QSTRINGBUILDER -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I. -isystem /nix/store/hj3nr3ab7xss7g0a8nyj4f8yysy7250d-qtbase-5.11.1-dev/include/QtWidgets -isystem /nix/store/hj3nr3ab7xss7g0a8nyj4f8yysy7250d-qtbase-5.11.1-dev/include/QtGui -isystem /nix/store/hj3nr3ab7xss7g0a8nyj4f8yysy7250d-qtbase-5.11.1-dev/include/QtNetwork -isystem /nix/store/hj3nr3ab7xss7g0a8nyj4f8yysy7250d-qtbase-5.11.1-dev/include/QtCore -I. -I/nix/store/5wgzqjpki4xnn9vw1nvfshkpbdlddmwi-apple-framework-OpenGL/Library/Frameworks/OpenGL.framework/Headers -I/nix/store/h9n23fgzmxbi0337n0b9zzh8cbsgh1fv-apple-framework-AGL/Library/Frameworks/AGL.framework/Headers -I. -I/nix/store/hj3nr3ab7xss7g0a8nyj4f8yysy7250d-qtbase-5.11.1-dev/mkspecs/macx-clang -o moc_threadformcontext.o moc_threadformcontext.cpp
clang++ -stdlib=libc++ -o qtchan main.o mainwindow.o threadform.o clickablelabel.o boardtab.o netcontroller.o threadtab.o post.o postform.o filter.o overlay.o threadtabhelper.o treemodel.o treeitem.o settings.o boardtabhelper.o captcha.o threadinfo.o chans.o you.o notificationtray.o treeview.o notificationview.o archivetab.o threadformcontext.o qrc_files.o moc_mainwindow.o moc_threadform.o moc_clickablelabel.o moc_boardtab.o moc_netcontroller.o moc_threadtab.o moc_postform.o moc_overlay.o moc_threadtabhelper.o moc_treeitem.o moc_treemodel.o moc_settings.o moc_boardtabhelper.o moc_captcha.o moc_threadinfo.o moc_notificationtray.o moc_treeview.o moc_notificationview.o moc_archivetab.o moc_threadformcontext.o   -lQt5Widgets -L/lib -framework DiskArbitration -framework IOKit -lQt5Gui -lQt5Network -lQt5Core -framework OpenGL -framework AGL
installing
post-installation fixup
strip is /nix/store/df6k4mgdjxciy0f637lryp7c9ln7n1m3-cctools-binutils-darwin/bin/strip
stripping (with command strip and flags -S) in /nix/store/4hjcqi3zg4iibf5igzqrhms01yrf8b0y-qtchan-0.100/bin
patching script interpreter paths in /nix/store/4hjcqi3zg4iibf5igzqrhms01yrf8b0y-qtchan-0.100
postPatchMkspecs
postPatchMkspecs
/nix/store/4hjcqi3zg4iibf5igzqrhms01yrf8b0y-qtchan-0.100

[xeji]

backport: 85a10bc