Cygwin: Implement sched_[gs]etaffinity() commit breaks RTEMS port

Hello,

the following commit:

commit 641ecb07533e85211b6abce334c85967f3f90209
Author: Mark Geisert <[email protected]>
Date:   Sun Jun 23 14:51:06 2019 -0700

     Cygwin: Implement sched_[gs]etaffinity()

     This patch set implements the Linux syscalls sched_getaffinity,
     sched_setaffinity, pthread_getaffinity_np, and pthread_setaffinity_np.
     Linux has a straightforward view of the cpu sets used in affinity 
masks.
     They are simply long (1024-bit) bit masks.  This code emulates that 
view
     while internally dealing with Windows' distribution of available 
CPUs among
     processor groups.

breaks the RTEMS port:

In file included from 
/usr/home/user/rtems-source-builder/rtems/build/aarch64-rtems6-gcc-55a600a6ce9-newlib-09e2ec87e-x86_64-freebsd12.0-1/gnu-mirror-gcc-55a600a6ce9/newlib/libc/include/pthread.h:31,
                  from ./gthr-default.h:31,
                  from 
../../../gnu-mirror-gcc-55a600a6ce9/libgcc/gthr.h:148,
                  from 
../../../gnu-mirror-gcc-55a600a6ce9/libgcc/emutls.c:31:
/usr/home/user/rtems-source-builder/rtems/build/aarch64-rtems6-gcc-55a600a6ce9-newlib-09e2ec87e-x86_64-freebsd12.0-1/gnu-mirror-gcc-55a600a6ce9/newlib/libc/include/sched.h:112:3: 
error: conflicting types for 'cpu_set_t'
   112 | } cpu_set_t;
       |   ^~~~~~~~~
../../../gnu-mirror-gcc-55a600a6ce9/libgcc/../newlib/libc/sys/rtems/include/sys/cpuset.h:67:18: 
note: previous declaration of 'cpu_set_t' was here
    67 | typedef cpuset_t cpu_set_t;
       |                  ^~~~~~~~~


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