Add libXfont as a Debian package dependency

It is needed to build Xvnc.

contrib/packages/deb/ubuntu-xenial/debian/control

@@ -3,7 +3,7 @@ Section: x11
 Priority: optional
 Maintainer: Brian P. Hinz <bphinz@users.sourceforge.net>
 Standards-Version: 3.8.4
-Build-Depends: debhelper (>> 7.1), zlib1g-dev, libjpeg-turbo8-dev, libxaw7-dev (>> 4.1.0), perl-modules, xfonts-base, xutils-dev, libx11-dev, libxau-dev, libxext-dev, libxi-dev, libxkbfile-dev, libxmu-dev, libxt-dev, x11proto-core-dev, cmake (>> 2.8), libgnutls-dev, libpam0g-dev, libpng12-dev, automake, autoconf, libtool, pkg-config, libpixman-1-dev, x11proto-bigreqs-dev, x11proto-composite-dev, x11proto-damage-dev, x11proto-dri2-dev, x11proto-fixes-dev, x11proto-fonts-dev, x11proto-gl-dev, x11proto-input-dev, x11proto-kb-dev, x11proto-randr-dev, x11proto-render-dev, x11proto-resource-dev, x11proto-scrnsaver-dev, x11proto-video-dev, x11proto-xext-dev, x11proto-xf86bigfont-dev, x11proto-xf86dga-dev, x11proto-xf86dri-dev, x11proto-xf86vidmode-dev, x11proto-xinerama-dev, libosmesa6-dev, libgl1-mesa-dev, libgl1-mesa-dri, libgl1-mesa-glx, libxfont-dev, x11proto-record-dev, default-jdk, libxtst-dev, libxft-dev, libexpat1-dev, libfontconfig1-dev, libxrender-dev, libpciaccess-dev, curl, bzip2, quilt, libglu1-mesa-dev, libxcursor-dev, libxinerama-dev, libxfixes-dev, libcairo2-dev, x11proto-dri3-dev, libgcrypt20-dev, x11proto-xcmisc-dev, x11proto-present-dev, xorg-server-source, libfltk1.3-dev, fluid
+Build-Depends: debhelper (>> 7.1), zlib1g-dev, libjpeg-turbo8-dev, libxaw7-dev (>> 4.1.0), perl-modules, xfonts-base, xutils-dev, libx11-dev, libxau-dev, libxext-dev, libxi-dev, libxkbfile-dev, libxmu-dev, libxt-dev, x11proto-core-dev, cmake (>> 2.8), libgnutls-dev, libpam0g-dev, libpng12-dev, automake, autoconf, libtool, pkg-config, libpixman-1-dev, x11proto-bigreqs-dev, x11proto-composite-dev, x11proto-damage-dev, x11proto-dri2-dev, x11proto-fixes-dev, x11proto-fonts-dev, x11proto-gl-dev, x11proto-input-dev, x11proto-kb-dev, x11proto-randr-dev, x11proto-render-dev, x11proto-resource-dev, x11proto-scrnsaver-dev, x11proto-video-dev, x11proto-xext-dev, x11proto-xf86bigfont-dev, x11proto-xf86dga-dev, x11proto-xf86dri-dev, x11proto-xf86vidmode-dev, x11proto-xinerama-dev, libosmesa6-dev, libgl1-mesa-dev, libgl1-mesa-dri, libgl1-mesa-glx, libxfont-dev, x11proto-record-dev, default-jdk, libxtst-dev, libxft-dev, libexpat1-dev, libfontconfig1-dev, libxrender-dev, libpciaccess-dev, curl, bzip2, quilt, libglu1-mesa-dev, libxcursor-dev, libxinerama-dev, libxfixes-dev, libxfont1-dev, libcairo2-dev, x11proto-dri3-dev, libgcrypt20-dev, x11proto-xcmisc-dev, x11proto-present-dev, xorg-server-source, libfltk1.3-dev, fluid
 Homepage: http://www.tigervnc.com
 
 Package: tigervncserver