Project:Toolchain/Glibc 2.32 porting notes/sysctl.h removal

From upstream release notes: removed. To support old binaries, the sysctl function continues to exist as a compatibility symbol (on those architectures which had it), but always fails with ENOSYS. This reflects the removal of the system call from all architectures, starting with Linux 5.5.
 * The deprecated  header and the sysctl function have been