add libqt5x11extras5-dev to AppVeyor Ubuntu dependency list

appveyor.yml

@@ -50,7 +50,7 @@ for:
 
   install:
     - sudo apt-get update
-    - sudo apt-get -y install gdb libavformat-dev libchromaprint-dev libfaad-dev libfftw3-dev libflac-dev libid3tag0-dev libmad0-dev libmodplug-dev libmp3lame-dev libmp4v2-dev libopusfile-dev libportmidi-dev libprotobuf-dev libqt5opengl5-dev libqt5sql5-sqlite libqt5svg5-dev librubberband-dev libshout3-dev libsndfile1-dev libsqlite3-dev libtag1-dev libupower-glib-dev libusb-1.0-0-dev libwavpack-dev portaudio19-dev protobuf-compiler qt5-default qtscript5-dev scons vamp-plugin-sdk qtkeychain-dev liblilv-dev
+    - sudo apt-get -y install gdb libavformat-dev libchromaprint-dev libfaad-dev libfftw3-dev libflac-dev libid3tag0-dev libmad0-dev libmodplug-dev libmp3lame-dev libmp4v2-dev libopusfile-dev libportmidi-dev libprotobuf-dev libqt5opengl5-dev libqt5sql5-sqlite libqt5svg5-dev librubberband-dev libshout3-dev libsndfile1-dev libsqlite3-dev libtag1-dev libupower-glib-dev libusb-1.0-0-dev libwavpack-dev portaudio19-dev protobuf-compiler qt5-default qtscript5-dev libqt5x11extras5-dev scons vamp-plugin-sdk qtkeychain-dev liblilv-dev
 
   build_script:
     - scons -j4 test=1 mad=1 faad=1 ffmpeg=1 opus=1 modplug=1 wv=1 hss1394=0 virtualize=0 debug_assertions_fatal=1 verbose=0 localecompare=1