ci: remove Travis-CI configuration

.travis.yml

@@ -1,72 +0,0 @@
-language: cpp
-compiler: gcc
-dist: xenial
-
-addons:
-  apt:
-    packages:
-    - libreadline6-dev
-    - libncurses5-dev
-    - perl
-    - clang
-    - g++-mingw-w64-i686
-    - qemu-system-x86
-
-install:
-  - ./.ci/travis-prepare.sh
-
-script:
-  - ./.ci/travis-build.sh
-
-matrix:
-  include:
-
-# Different configurations of default gcc and clang
-
-  - env: BASE=7.0
-
-  - env: BASE=7.0
-    compiler: clang
-
-  - env: BASE=7.0 EXTRA="CMD_CXXFLAGS=-std=c++11"
-
-  - env: BASE=7.0 EXTRA="CMD_CXXFLAGS=-std=c++11"
-    compiler: clang
-
-# Trusty: compiler versions very close to RHEL 7
-
-  - env: BASE=7.0
-    dist: trusty
-
-  - env: BASE=7.0 EXTRA="CMD_CXXFLAGS=-std=c++11"
-    dist: trusty
-
-# Cross-compilation to Windows using MinGW and WINE
-
-  - env: BASE=7.0 WINE=32 TEST=NO STATIC=YES
-    compiler: mingw
-
-  - env: BASE=7.0 WINE=32 TEST=NO STATIC=NO
-    compiler: mingw
-
-# Cross-compilation to RTEMS
-
-  - env: BASE=7.0 RTEMS=4.10 TEST=NO
-
-  - env: BASE=7.0 RTEMS=4.9 TEST=NO
-
-# Other gcc versions (adding as an extra package)
-
-  - env: BASE=7.0
-    compiler: gcc-6
-    addons: { apt: { packages: ["g++-6"], sources: ["ubuntu-toolchain-r-test"] } }
-
-  - env: BASE=7.0
-    compiler: gcc-7
-    addons: { apt: { packages: ["g++-7"], sources: ["ubuntu-toolchain-r-test"] } }
-
-# MacOS build
-
-  - env: BASE=7.0
-    os: osx
-    compiler: clang