[Bug c++/70702] Build failure of ARM cross compiler under Cygwin - libc_name_p

[olivier at gautherot dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70702

--- Comment #2 from Olivier Gautherot <olivier at gautherot dot net> ---
Last correction: the build under FreeBSD uses GCC 5.3 and requires the same fix
to build.