[ci] remove travis configuration

.travis.yml

@@ -1,56 +0,0 @@
-sudo: required
-dist: trusty
-
-os: linux
-
-language: c
-
-compiler:
-  - gcc
-
-matrix:
-  include:
-    - os: linux
-      compiler: gcc
-    - os: linux
-      compiler: clang
-  exclude:
-    - compiler: gcc
-
-addons:
-  apt:
-    packages:
-      - gdb
-      - libx11-dev
-      - libxrandr-dev
-      - libxi-dev
-      - libxv-dev
-      - libcups2-dev
-      - libxdamage-dev
-      - libxcursor-dev
-      - libxext-dev
-      - libxinerama-dev
-      - libxkbcommon-dev
-      - libxkbfile-dev
-      - libxml2-dev
-      - libasound2-dev
-      - libgstreamer1.0-dev
-      - libgstreamer-plugins-base1.0-dev
-      - libpulse-dev
-      - libpcsclite-dev
-      - libgsm1-dev
-      - libavcodec-dev
-      - libavutil-dev
-      - libxext-dev
-      - ninja-build
-      - libsystemd-dev
-      - libwayland-dev
-
-before_script:
-  - ulimit -c unlimited -S 
-
-script:
-  - sudo hostname travis-ci.local
-  - cmake -G Ninja -C ci/cmake-preloads/config-linux-all.txt -D CMAKE_BUILD_TYPE=Debug .
-  - make
-  - make test