drop obsolete .travis.yml

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

.travis.yml

@@ -1,27 +0,0 @@
-language: c
-cache:
-    ccache: true
-    directories:
-        - $HOME/Library/Caches/Homebrew
-branches:
-    except:
-        - /appveyor.*/
-
-os: osx
-osx_image: xcode9.2
-
-matrix:
-  include:
-    - env: TOOL=meson
-    - env: TOOL=autotools
-
-install:
-    - brew update
-    - HOMEBREW_NO_AUTO_UPDATE=1 brew install ccache meson
-
-script:
-    - ./test/scripts/build-travis-osx.sh $TOOL
-    - ccache -s
-
-before_cache:
-    - brew cleanup