[PATCH] Define GNULIB_NAMESPACE in unittests/string_view-selftests.c

[Joel Brobecker]

> I pushed the patch to un-break the mingw build.

Thank you!

> Could you remind me what's the link between putting gdb in its own
> namespace and putting gnulib in its own namespace?  How are they
> related?

I think it's about making it easier to debug code that's declared
inside a namespace. In other words, it allows us to say "break
run_command", rather than having to type "break gdb::run_command".

-- 
Joel