Add FreeBSD build for Cirrus

[kwkwan]

Previously we had a Jenkins job to run FreeBSD builds but we need to migrate to Cirrus. The Jenkins is being decommissioned.

https://cirrus-ci.org/guide/FreeBSD/

Here's the original script:

(Master branch)

#!/bin/bash -x

whoami

export PATH=$PATH:/usr/local/bin

function install_packages() {
  brew update
  brew install openssl
  brew install make
  brew install cmake
  brew install autoconf
  brew install automake
  brew install libtool
  brew install cmocka
  brew install pkg-config
}

mkdir -p deps
export CMOCKA_INSTALL="$(pwd)/deps/cmocka-install"
export CHECKPATCH_INSTALL="$(pwd)/deps/checkpatch-install"
export TRAVIS_PULL_REQUEST="false"
mkdir -p $CMOCKA_INSTALL

install_packages

if [ -d ~/builds/cmocka ]; then
  rm -rf ~/builds/cmocka
fi

./ci/install.sh

ls -alR ${CMOCKA_INSTALL}

ls -alR "~/builds/cmocka-build"

./ci/main.sh

(Pull request)

#!/bin/bash -x

whoami

. ci/env-freebsd.sh
./ci/before_install.sh
./ci/install.sh
./ci/main.sh

[pablo-mendoza]

Fixed by https://github.com/riboseinc/retrace/pull/411