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loader: Make vidc_biosputchar static
It's currently unused outside of vidconsole.c. Gerald Hicks' fix to the
beep code from de37e4a6d2333/1998 introduced the funciton as
static. Maxim Sobolev (sobomax) made it non-static since his spinconsole
called it in c4c3b35172d67/2009. When sobomax dropped the direct call
after making spinconsole console independent in b35172d67/2017,
vidc_biosputchar remained a harmless unreferenced global. Make it static
once again.
Fixes: c7e10205ae
Sponsored by: Netflix
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@ -1046,7 +1046,7 @@ vidc_init(int arg)
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return (0); /* XXX reinit? */
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}
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void
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static void
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vidc_biosputchar(int c)
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{
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