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

libvpx/source/libvpx/vp8/encoder/x86/quantize_ssse3.asm

 ;
 ;  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 ;
 ;  Use of this source code is governed by a BSD-style license and patent
 ;  grant that can be found in the LICENSE file in the root of the source
 ;  tree. All contributing project authors may be found in the AUTHORS
 ;  file in the root of the source tree.
 ;
 
 
 %include "vpx_ports/x86_abi_support.asm"
 
 
 ;int vp8_fast_quantize_b_impl_ssse3(short *coeff_ptr
 ;               short *qcoeff_ptr,short *dequant_ptr,
 ;               short *round_ptr,
 ;               short *quant_ptr, short *dqcoeff_ptr);
 ;
-global sym(vp8_fast_quantize_b_impl_ssse3)
+global sym(vp8_fast_quantize_b_impl_ssse3) PRIVATE
 sym(vp8_fast_quantize_b_impl_ssse3):
     push        rbp
     mov         rbp, rsp
     SHADOW_ARGS_TO_STACK 6
     GET_GOT     rbx
     push        rsi
     push        rdi
     ; end prolog
 
     mov         rdx, arg(0)                 ;coeff_ptr
@@ skipping 75 matching lines @@
     pop         rsi
     RESTORE_GOT
     UNSHADOW_ARGS
     pop         rbp
     ret
 
 SECTION_RODATA
 align 16
 zz_shuf:
     db 0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15