Tools: remove remove redundant install-apt-ci.sh

this isn't referenced anywhere and is causing unnecessary maintenance overhead.

Presumably overtaken by github docker install images and the devenv install scripts

Tools/scripts/install-apt-ci.sh

@@ -1,25 +0,0 @@
-#!/bin/bash
-# Install APT packages for CI build testing
-
-set -ex
-
-PKGS=" \
-    build-essential \
-    gawk \
-    libc6-i386 \
-    libxml2-dev \
-    libxslt1-dev \
-    python-pip \
-    python-dev \
-    zlib1g-dev \
-    "
-
-read -r UBUNTU_CODENAME <<<$(lsb_release -c -s)
-
-sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
-
-#wget -q -O - http://llvm.org/apt/llvm-snapshot.gpg.key | sudo apt-key add -
-#sudo add-apt-repository "deb http://llvm.org/apt/${UBUNTU_CODENAME}/ llvm-toolchain-${UBUNTU_CODENAME}-3.7 main" -y
-sudo apt-get -qq -y --force-yes update
-sudo apt-get -qq -y --force-yes remove clang llvm
-sudo apt-get -y --force-yes install $PKGS