BREAK: manual.yaml: don't set any default env vars

buildstream 1.3.1

=================

  o BREAKING CHANGE: The 'manual' element lost its default 'MAKEFLAGS' and 'V'

    environment variables. There is already a 'make' element with the same

    variables. Note that this is a breaking change, it will require users to

    make changes to their .bst files if they are expecting these environment

    variables to be set.

  o Failed builds are included in the cache as well.

    `bst checkout` will provide anything in `%{install-root}`.

    A build including cached fails will cause any dependant elements

# This version is bumped whenever enhancements are made

# to the `project.conf` format or the core element format.

#

BST_FORMAT_VERSION = 17

BST_FORMAT_VERSION = 18

# The base BuildStream artifact version

# No variables added for the manual element by default, set

# this if you plan to use make, and the sources cannot handle

# parallelization.

#

# variables:

#

#   notparallel: True

# Manual build element does not provide any default

# build commands

config:

  strip-commands:

  - |

    %{strip-binaries}

# Use max-jobs CPUs for building and enable verbosity

environment:

  MAKEFLAGS: -j%{max-jobs}

  V: 1

# And dont consider MAKEFLAGS or V as something which may

# affect build output.

environment-nocache:

- MAKEFLAGS

- V