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64-bit Mac Chromium support for libvpx.

For 64-bit Mac Chromium, use private_extern for HIDDEN_DATA, the same as
32-bit Mac Chromium.

Change-Id: Ica0fa9e48a47409facece691ae1e39327369083c

--- a/vpx_ports/x86_abi_support.asm

+++ b/vpx_ports/x86_abi_support.asm

@@ -230,6 +230,12 @@

   %elifidn __OUTPUT_FORMAT__,elfx32

     %define WRT_PLT wrt ..plt

     %define HIDDEN_DATA(x) x:data hidden

+  %elifidn __OUTPUT_FORMAT__,macho64

+    %ifdef CHROMIUM

+      %define HIDDEN_DATA(x) x:private_extern

+    %else

+      %define HIDDEN_DATA(x) x

+    %endif

   %else

     %define HIDDEN_DATA(x) x

   %endif