Bug#844660: mkvtoolnix FTBFS with QT 5.7

[Adrian Bunk <bunk@stusta.de>]

Source: mkvtoolnix
Version: 9.5.0-1
Severity: serious

https://buildd.debian.org/status/package.php?p=mkvtoolnix&suite=sid

...
         CXX src/info/qt_ui.cpp
In file included from src/common/common_pch.h:4:0:
src/info/ui/mainwindow.h: In member function 'void Ui_main_window::retranslateUi(QMainWindow*)':
src/common/common.h:81:45: error: 'pgettext' was not declared in this scope
 #  define PY(context, s) pgettext(context, s)
                                             ^
src/common/qt.h:28:32: note: in expansion of macro 'PY'
 #define QPTR(s, context) to_qs(PY(context, s))
                                ^~
src/info/ui/mainwindow.h:106:37: note: in expansion of macro 'QPTR'
         main_window->setWindowTitle(QPTR("mkvInfo", Q_NULLPTR));
                                     ^
compilation terminated due to -Wfatal-errors.
debian/rules:16: recipe for target 'override_dh_auto_configure' failed
make[1]: *** [override_dh_auto_configure] Error 1
make[1]: Leaving directory '/«PKGBUILDDIR»'
debian/rules:13: recipe for target 'build-arch' failed
make: *** [build-arch] Error 2
dpkg-buildpackage: error: debian/rules build-arch gave error exit status 2