message: install-deps: Use embedded yaml-cpp on FreeBSD.
diff: @@ -92,6 +92,14 @@ fetch_and_unpack_embeds()
  https://github.com/contour-terminal/libunicode/archive/447bc8790f1db8183e3212472fa90e3c4ce34787.tar.gz
  }
  +fetch_and_unpack_yaml_cpp()
  +{
  + fetch_and_unpack \
  + yaml-cpp-yaml-cpp-0.7.0 \
  + yaml-cpp-0.7.0.tar.gz \
  + https://github.com/jbeder/yaml-cpp/archive/refs/tags/yaml-cpp-0.7.0.tar.gz
  +}
  +
  fetch_and_unpack_hbft()
  {
  # optional
  @@ -176,6 +184,8 @@ install_deps_ubuntu()
  install_deps_FreeBSD()
  {
  + fetch_and_unpack_yaml_cpp
  +
  [ x$PREPARE_ONLY_EMBEDS = xON ] && return
  su root -c "pkg install $SYSDEP_ASSUME_YES \
  @@ -196,8 +206,8 @@ install_deps_FreeBSD()
  qt5-qmake \
  qt5-widgets \
  range-v3 \
  - yaml-cpp \
  "
  + # yaml-cpp is available on FreeBSD too, but its .cmake file seems to be buggy.
  }
  install_deps_arch()
  