* Makeconfig (+includes): Add $($(stdio)-include).
(libio-include): New variable.
* stdlib/strtod.c: Put weak_symbol after function defn.
* stdlib/strtol.c: Likewise.
* configure.in (--enable-libio): If not present, set $stdio to
"default". Move stdio/libio check to end, so sysdeps fragments
can affect it. Reset $stdio to "stdio" if it's "default".
* sysdeps/unix/sysv/linux/configure: New file.
054cc4cc38