Add srfi 64 links

srfi/:64

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+%3a64

srfi/:64.sls

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+%3a64.sls

srfi/private/platform-features.chezscheme.sls

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+;; Copyright (c) 2009 Derick Eddington.  All rights reserved.  Licensed under an
+;; MIT-style license.  My license is in the file named LICENSE from the original
+;; collection this file is distributed with.  If this file is redistributed with
+;; some other collection, my license must also be included.
+
+(library (srfi private platform-features)
+  (export
+    OS-features
+    implementation-features)
+  (import
+    (rnrs)
+    (only (chezscheme) machine-type)
+    (srfi private OS-id-features))
+
+  (define (OS-features)
+    (OS-id-features
+     (symbol->string (machine-type))
+     '(("i3la" linux posix))))
+
+  (define (implementation-features)
+    '(chezscheme))
+)