relibc now provides the real <byteswap.h> header and Linux mmap
extension flags (MAP_LOCKED, MAP_HUGETLB, etc.) in <sys/mman.h>.
Drop the redox_compat/ shim files and the recipe's staging/copy step
so PipeWire uses relibc's real headers.
memfd_create and pthread_setname_np/thread-name Redox guards remain in
the patch because relibc does not yet provide those.
vasilito
787b5b6702