Document multiarch release goal scope.

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+[[!meta title="Release Series 1 Multiarch Release Goal"]]
+
+A goal for release 1.0.0 is partial multiarch support.
+
+
+Scope
+=====
+
+It should be possible to manually install packages of specific architectures to
+facilitate cross building and cross installation of packages.  Additionally, all
+packages that provide architecture-dependent files and are to be coinstallable
+should support coinstallation, so that no major changes need to be made to file
+locations to complete the multiarch implementation.  Note that coinstallability
+itself is not a goal for this release series.
+
+This means that:
+
+  * A filesystem hierarchy with architecture-dependent paths for libraries and
+    executable programs should be designed and documented in the Packaging
+    Policy,
+  * Architecture-dependent files provided by packages that are to be
+    coinstallable should be installed in architecture-dependent locations,
+  * To the extent possible and reasonable, architecture-independent files should
+    not be provided by packages that are to be coinstallable,
+  * Relevant toolchain packages should be configured and/or patched to use
+    architecture-dependent library paths, and
+  * The `PATH` environment variable should be set to contain native-architecture
+    executable program directories.
+
+Not included in this release goal are:
+
+  * Control information to document package coinstallability and
+    inter-architecture dependency satisfaction or
+  * Handling of architecture-independent files provided by coinstallable
+    architecture-dependent packages or other coinstallability considerations in
+    package management.