[PATCH v3] <shlib-compat.h>: Support compat_symbol_reference for _ISOMAC

[Florian Weimer]

* Andreas Schwab:

> On Mär 03 2021, Florian Weimer via Libc-alpha wrote:
>
>> +/* Use __symbol_version_reference to specify the version a symbol
>
> s/__//

Thanks.  Okay with this change?

Florian