[PATCH, libstdc++]: Fix another instance of -Werror=attributes bootststrap failure

[Jonathan Wakely]

On 25/09/17 11:11 +0200, Uros Bizjak wrote:
>Hello!
>
>Attached patch fixes -Werror=attributes bootstrap failure on
>alphaev68-linux-gnu. The patch declares the alias without a prototype,
>as suggested in [1].
>
>2017-09-25  Uros Bizjak  <ubizjak@gmail.com>
>
>    PR c/81854
>    * src/c++98/complex_io.cc (_GLIBCXX_LDBL_COMPAT): Declare alias
>    target as a C++ function with no prototype.
>
>Bootstrapped and regression tested on alphaev68-linux-gnu.
>
>OK for mainline?

OK, thanks.