Define PRIVATE and add it to all global symbols so we don't export assembly functions.

libvpx/source/libvpx/vp8/encoder/x86/variance_impl_ssse3.asm

 ;
 ;  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 ;
 ;  Use of this source code is governed by a BSD-style license
 ;  that can be found in the LICENSE file in the root of the source
 ;  tree. An additional intellectual property rights grant can be found
 ;  in the file PATENTS.  All contributing project authors may
 ;  be found in the AUTHORS file in the root of the source tree.
 ;
 
@@ skipping 11 matching lines @@
 ;    int src_pixels_per_line,
 ;    unsigned int Height,
 ;    int  xoffset,
 ;    int  yoffset,
 ;    int *sum,
 ;    unsigned int *sumsquared;;
 ;
 ;)
 ;Note: The filter coefficient at offset=0 is 128. Since the second register
 ;for Pmaddubsw is signed bytes, we must calculate zero offset seperately.
-global sym(vp8_filter_block2d_bil_var_ssse3)
+global sym(vp8_filter_block2d_bil_var_ssse3) PRIVATE
 sym(vp8_filter_block2d_bil_var_ssse3):
     push        rbp
     mov         rbp, rsp
     SHADOW_ARGS_TO_STACK 9
     SAVE_XMM
     GET_GOT     rbx
     push rsi
     push rdi
     ; end prolog
 
@@ skipping 312 matching lines @@
 align 16
 vp8_bilinear_filters_ssse3:
     times 8 db 128, 0
     times 8 db 112, 16
     times 8 db 96,  32
     times 8 db 80,  48
     times 8 db 64,  64
     times 8 db 48,  80
     times 8 db 32,  96
     times 8 db 16,  112