Deb: add lots of libraries as build dependencies

This way, no need to copy that over multiple dockerfiles, and is a best
practice.

debian/control

@@ -2,7 +2,8 @@ Source: kasmvnc
 Section: x11
 Priority: optional
 Maintainer: Kasm Technologies LLC <info@kasmweb.com>
-Build-Depends: debhelper (>= 11), rsync
+Build-Depends: debhelper (>= 11), rsync, libjpeg-dev, libjpeg-dev, libpng-dev,
+  libtiff-dev, libgif-dev, libavcodec-dev, libssl-dev, libgl1, libxfont2
 Standards-Version: 4.1.3
 Homepage: https://github.com/kasmtech/KasmVNC
 #Vcs-Browser: https://salsa.debian.org/debian/kasmvnc