[Libguestfs] Add support for musl libc

[Jakub Jirutka]

Hi,

I’m trying to compile libguestfs on Alpine Linux, that uses musl libc (lightweight, fast and simple standards-conformance libc). It fails in the check phase due to missing glibc-style extended printf formatters.

--
checking for register_printf_specifier... no
checking for register_printf_function... no
configure: error: in `/tmp/libguestfs/src/libguestfs-1.32.6’:
configure: error: No support for glibc-style extended printf formatters.

This means you either have a very old glibc (pre-2.0) or you
are using some other libc where this is not supported.
See `config.log’ for more details
--

Could you please add support for musl libc, i.e. avoid using glibc-specific extensions? How often are such non-standard functions used in the libguestfs code-base; can we just patch few occurrences or is it too widespread?

Thanks,
Jakub Jirutka
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