CI: Remove unused Linux script

CI/install-dependencies-linux-ubuntu16.sh

-#!/bin/sh
-set -ex
-
-sudo apt-get -qq update
-sudo apt-get install -y \
-        build-essential \
-        checkinstall \
-        cmake \
-        libasound2-dev \
-        libavcodec-dev \
-        libavdevice-dev \
-        libavfilter-dev \
-        libavformat-dev \
-        libavutil-dev \
-        libcurl4-openssl-dev \
-        libfdk-aac-dev \
-        libfontconfig-dev \
-        libfreetype6-dev \
-        libgl1-mesa-dev \
-        libjack-jackd2-dev \
-        libjansson-dev \
-        libluajit-5.1-dev \
-        libpulse-dev \
-        libqt5x11extras5-dev \
-        libspeexdsp-dev \
-        libswresample-dev \
-        libswscale-dev \
-        libudev-dev \
-        libv4l-dev \
-        libvlc-dev \
-        libx11-dev \
-        libx264-dev \
-        libxcb-randr0-dev \
-        libxcb-shm0-dev \
-        libxcb-xinerama0-dev \
-        libxcomposite-dev \
-        libxinerama-dev \
-        pkg-config \
-        python3-dev \
-        qtbase5-dev \
-        libqt5svg5-dev \
-        swig
-
-
-# build mbedTLS
-cd ~/projects
-mkdir mbedtls
-cd mbedtls
-mbedtlsPath=$PWD
-curl -L -O https://github.com/ARMmbed/mbedtls/archive/mbedtls-2.12.0.tar.gz
-tar -xf mbedtls-2.12.0.tar.gz
-mkdir build
-cd ./build
-cmake -DENABLE_TESTING=Off -DUSE_SHARED_MBEDTLS_LIBRARY=On ../mbedtls-mbedtls-2.12.0
-make -j 12
-sudo make install
-
-# return to OBS build dir
-cd $APPVEYOR_BUILD_FOLDER