[RFA 2/3] libctf: Add configure check for asprintf (for MinGW)

[Joel Brobecker]

> > libctf/ChangeLog:
> >
> > 	PR binutils/25155:
> > 	* configure.ac: Add AC_CHECK_DECLS([asprintf]).
> > 	* configure, config.h.in: Regenerate.
> 
> Looks good.

Thanks, Nick. Pushed to master.

I will also push to gdb-9-branch but I'll email gdb-patches
about that.

-- 
Joel