Do not do sudo command.

- Install all packages using travis apt plugin
- Copy ninja binary in $HOME/bin.

We still need sudo required because travis image has more memory in this
case and this is needed to test big cluster in libzim.

.travis.yml

@@ -76,3 +76,16 @@ addons:
       - ubuntu-toolchain-r-test
     packages:
       - g++-5
+      - cmake
+      - python3-pip
+      - zlib1g-dev
+      - libjpeg-dev
+      - libmagic-dev
+      - ctpp2-utils
+      - libctpp2-dev
+      - libmicrohttpd-dev
+      - g++-mingw-w64-i686
+      - gcc-mingw-w64-i686
+      - gcc-mingw-w64-base
+      - mingw-w64-tools
+      - default-jdk

travis/install_extra_deps.sh

@@ -4,15 +4,13 @@ set -e
 
 orig_dir=$(pwd)
 
-sudo apt-get update -qq
-sudo apt-get install -qq python3-pip zlib1g-dev libjpeg-dev
 pip3 install --user --upgrade pip wheel
 pip3 install --user pillow meson==0.43.0
 
 # ninja
 wget https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-linux.zip
 unzip ninja-linux.zip ninja
-sudo cp ninja /bin
+cp ninja $HOME/bin
 
 cd $orig_dir