.travis.yml: drop MacOSX

This keeps breaking on Travis so lets just fall back to the Cirrus CI
builds which seem to be better maintained. Fix up the comments while
we are doing this as we never had a windows build.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200501111505.4225-3-alex.bennee@linaro.org>

.travis.yml

@@ -9,9 +9,8 @@ compiler:
 cache:
   # There is one cache per branch and compiler version.
   # characteristics of each job are used to identify the cache:
-  # - OS name (currently, linux, osx, or windows)
+  # - OS name (currently only linux)
   # - OS distribution (for Linux, xenial, trusty, or precise)
-  # - macOS image name (e.g., xcode7.2)
   # - Names and values of visible environment variables set in .travis.yml or Settings panel
   timeout: 1200
   ccache: true
@@ -271,31 +270,6 @@ jobs:
         - TEST_CMD=""
 
 
-    # MacOSX builds - cirrus.yml also tests some MacOS builds including latest Xcode
-
-    - name: "OSX Xcode 10.3"
-      env:
-        - BASE_CONFIG="--disable-docs --enable-tools"
-        - CONFIG="--target-list=i386-softmmu,ppc-softmmu,ppc64-softmmu,m68k-softmmu,x86_64-softmmu"
-      os: osx
-      osx_image: xcode10.3
-      compiler: clang
-      addons:
-        homebrew:
-          packages:
-            - ccache
-            - glib
-            - pixman
-            - gnu-sed
-            - python
-          update: true
-      before_script:
-        - brew link --overwrite python
-        - export PATH="/usr/local/opt/ccache/libexec:$PATH"
-        - mkdir -p ${BUILD_DIR} && cd ${BUILD_DIR}
-        - ${SRC_DIR}/configure ${BASE_CONFIG} ${CONFIG} || { cat config.log && exit 1; }
-
-
     # Python builds
     - name: "GCC Python 3.5 (x86_64-softmmu)"
       env: