* pbuilder-satisfydepends-experimental, Makefile: alternate
implementation of pbuilder-satisfydepends which supports pulling build-deps with a version on the apt-get command-line; this is derived from pbuilder-satisfydepends with the following changes: - Add and use new package_versions() and candidate_version() helpers; the former returns all versions of a package available via APT, the later APT's candidate version. - For versionned build-deps, when building the "apt-get install" command, try APT's candidate version or all available versions available from APT in ascending order (the reverse order of apt-cache's output); checkbuilddep_versiondeps() isn't used for this part of the process anymore, but it is still used to honor build-conflicts. - Recover from APT errors caused by unsufficient dependencies ("libfoo-dev Depends: bar but baz is to be installed") and missing dependencies libfoo-dev Depends: bar but it is not going to be installed", or simply "libfoo-dev Depends: bar"); this permits simply listing build-deps when uploading to experimental; achieved by moving the version matching logic in the new versioneddep_to_aptcmd() helper. * pbuilderrc, pbuilderrc.5: document the availability of the alternate implementation.
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