Update PyInstaller env

We now use PyQt5 from PyPI and apply xoviat's patch for PyQt.

misc/requirements/requirements-pyinstaller.txt

@@ -1,3 +1,5 @@
 # This file is automatically generated by scripts/dev/recompile_requirements.py
 
--e git+https://github.com/pyinstaller/pyinstaller.git#egg=PyInstaller
+-e git+https://github.com/pyinstaller/pyinstaller.git@develop#egg=PyInstaller
+PyQt5==5.8
+sip==4.19.1

misc/requirements/requirements-pyinstaller.txt-raw

@@ -1,4 +1,5 @@
 -e git+https://github.com/pyinstaller/pyinstaller.git@develop#egg=PyInstaller
+PyQt5
 
 # remove @commit-id for scm installs
-#@ replace: @.*# #
+#@ replace: @.*# @develop#

tox.ini

@@ -258,7 +258,12 @@ deps =
     -r{toxinidir}/misc/requirements/requirements-pip.txt
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/misc/requirements/requirements-pyinstaller.txt
+whitelist_externals =
+    patch
+    wget
 commands =
+    wget https://patch-diff.githubusercontent.com/raw/pyinstaller/pyinstaller/pull/2403.patch -O {envtmpdir}/pyqt.patch -o/dev/null
+    patch -f -p1 -d {envdir}/src/pyinstaller -i {envtmpdir}/pyqt.patch
     {envpython} scripts/link_pyqt.py --tox {envdir}
     {envbindir}/pyinstaller --noconfirm misc/qutebrowser.spec