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/usr/lib/gcc-cross/arm-linux-gnueabihf/7/plugin/include/config/linux-protos.h is in gcc-7-plugin-dev-arm-linux-gnueabihf 7.3.0-16ubuntu3cross1.

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/* Prototypes.
   Copyright (C) 2013-2017 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

extern bool linux_has_ifunc_p (void);

extern bool linux_libc_has_function (enum function_class fn_class);