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templater: do search for include of unqualified builtin outside of config code

Authored by martinvonz.

Description

templater: do search for include of unqualified builtin outside of config code

Commit 081b08e4ea13 (templater: look for mapfiles in template paths,
2015-05-15) added support for using things like `%include
map-cmdline.default` to include built-in map files without using a
valid path to them. This patch rewrites that support by moving it into
_readmapfile() so it can later be adapted for reading from a
non-file resource.

Differential Revision: https://phab.mercurial-scm.org/D8792