by a GOT relocation to make Scrt1.o position independent.
* sysdeps/s390/s390-64/elf/start.S: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/syscall.S: Add support for
six system call parameters.
* sysdeps/unix/sysv/linux/s390/s390-64/syscall.S: Likewise.