context: safegaurd against 'lx' being passed as file flag in manifest
Subversion can have a file as executable link. When using hgsubversion, we will
have both islink and isexec True. This will lead to _flags being set to `lx`.
However, manifest expects flag to be one-byte so it will crash if 'lx' is
passed. Also it's impossible to have an executable link.
This patch will safegaurd us from having 'lx' being a possible value.
This was authored by Ivan Lezhankin from Yandex.
Differential Revision: https://phab.mercurial-scm.org/D3985
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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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
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See https://mercurial-scm.org/ for detailed installation
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