[Libva] [PATCH] Add ATTRIBUTE_HIDDEN helper

[Gwenole Beauchesne]

Hi,

This patch adds ATTRIBUTE_HIDDEN defined as  
__attribute__((visibility("hidden"))) wherever available.

The aim is to not expose private VA API, i.e. internal functions.  
Candidates are functions like dri_get_drawable(), dri_swap_buffer(),  
etc. Probably VA_*() functions too but I noticed one day that GMA500  
used them? (or my backtrace was broken).

Usage:
<usual function declaration> ATTRIBUTE_HIDDEN;

e.g. int some_function(void) ATTRIBUTE_HIDDEN;

Regards,
Gwenole.

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