hash: Add support for arrays

There is now builtin support for stdplus::hash<> and
stdplus::hashMulti(...) hashing std::array<> and C array containers.

Change-Id: I111511fcd2c1627011b47cf3593cc9d63d752c1a
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/meson.build b/src/meson.build
index ed994ea..b367dc4 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -48,6 +48,7 @@
   'handle/copyable.cpp',
   'handle/managed.cpp',
   'hash.cpp',
+  'hash/array.cpp',
   'hash/tuple.cpp',
   'pinned.cpp',
   'raw.cpp',