Bug#856306: add tilegx architecture support to systemd

[Helmut Grohne]

Source: systemd
Tags: upstream patch
User: helmutg at debian.org
Usertags: rebootstrap

systemd fails to cross build for tilegx (and likely fails to build
natively as well), because the LIB_ARCH_TUPLE is missing. It has since
been added to dpkg's cputable. Thus I am attaching the obvious patch
setting it to "tilegx-linux-gnu". I am also Ccing Chris Metcalf, who has
been porting software to tilegx, for review. After applying it, a stage1
of systemd cross builds successfully.

I also note that more updates for LIB_ARCH_TUPLE are likely to come. sh3
currently receives a LIB_ARCH_TUPLE of "sh4-linux-gnu", arm64ilp32 is
missing. A pile of recent mips stuff is absent. I notified the relevant
porters. See e.g. https://github.com/systemd/systemd/pull/5469.

Helmut
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