Put AT_CLKTCK in ELF auxiliary vectors because some functions
use the value as described below.
1. GLRO(dl_clktck) set by
_dl_aux_init (in glibc/elf/dl-support.c)
or
_dl_sysdep_start (in elf/dl-sysdep.c)
2. GLRO(dl_clktck) is referenced by
__sysconf (in glibc/sysdeps/posix/sysconf.c)
__getclktck
(in glibc/sysdeps/unix/sysv/linux/getclktck.c)
profil (in glibc/sysdeps/posix/profil.c)
__profile_frequency
(in glibc/sysdeps/unix/sysv/linux/prof-freq.c)
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