Update to NSPR 4.9.5, part 1: MPL 2 upgrade only.

mozilla/nsprpub/pr/src/md/unix/os_Darwin.s

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+# This Source Code Form is subject to the terms of the Mozilla Public
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 #ifdef __i386__
 #include "os_Darwin_x86.s"
 #elif defined(__x86_64__)
 #include "os_Darwin_x86_64.s"
 #elif defined(__ppc__)
 #include "os_Darwin_ppc.s"
 #endif