packaging: dynamically define make targets
We currently have make boilerplate for each instance of a distro's
release. This is redundant, annoying to maintain, and prone to errors.
This commit defines variables holding available releases for
various distros. We then iterate through the list and dynamically
define make targets.
Differential Revision: https://phab.mercurial-scm.org/D3761
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.