Unable to compile today's version

[jsbien]

In file included from replacements.cpp:4:0:
replacements.h:25:2: error: ‘QUrl’ does not name a type
  QUrl replace(const QUrl& url) const;
  ^~~~
replacements.cpp:43:1: error: ‘QUrl’ does not name a type
 QUrl Replacements::replace(const QUrl& url) const
 ^~~~
Makefile:857: recipe for target 'replacements.o' failed
make[2]: *** [replacements.o] Error 1
make[2]: Leaving directory '/home/jsbien/djview-poliqarp/src'
debian/rules:8: recipe for target 'override_dh_auto_build' failed
make[1]: *** [override_dh_auto_build] Error 2
make[1]: Leaving directory '/home/jsbien/djview-poliqarp'
debian/rules:28: recipe for target 'build' failed
make: *** [build] Error 2

[Michał Rudolf]

Fix compilation. Closes #275

→ <<cset 722fbc6b4fff>>