Update README

README

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-libgsystem is intended to be used as a git external for components
-that depend on GLib, but accept a hard dependency on things which are
-difficult to do in GLib itself.  For example, the local-alloc API
-depends on GCC/clang.
-
-It will also be a useful place to evolve new APIs (e.g. logging)
-before their eventual inclusion in GLib (if ever).
-
-There's no bugzilla component currently, please mail
-patches to: walters@verbum.org

README.md

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+libglnx is the successor to libgsystem: https://git.gnome.org/browse/libgsystem
+
+It is for modules which depend on both GLib and Linux, intended to be
+used as a git submodule.