[cairo] __visibility__ bug fix

[Keith Packard]

Around 21 o'clock on Dec 20, =?ISO-8859-1?Q?Kristian_H=F8gsberg?= wrote:

>    extern __internal_linkage cairo_gstate_t *
>    _cairo_gstate_create (void);
> 
> This works for me with gcc 3.4 and 2.96, and it has the storage 
> specifiers grouped together at the beginning of the line.

And would let us use a simple #define for symbols private to cairo but 
which need to be extern as they are shared among multiple files.  
Something like

	cairo_private cairo_gstate_t *
	_cairo_gstate_create (void);

Question -- do we need to have 'extern' here?  It's normally superfluous in 
function declarations.

-keith


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