Remove non-existanec functions/variables from libc.so

See b.android.com/69319

android-9+
  __evOptMonoTime
  _nres
  __p_default_section_syms
  __p_update_section_syms
  _rand48_add
  _rand48_mult
  _rand48_seed
  _res_opcodes
  __sFext

android-12+
  copy_tm_to_TM
  copy_TM_to_tm
  __dtoa
  _endhtent
  __fremovelock
  _gethtbyaddr
  _gethtbyname
  _gethtbyname2
  _gethtent
  __libc_android_abort
  _mktemp                 # mktemp already exist in header
  __pread64               # add pread64, pwrite64 and ftruncate64 to API >= 12
  __pwrite64
  res_need_init
  __res_ourserver_p
  _sethtent
  __set_syscall_errno
  __sfvwrite
  __timer_table_start_stop
  valid_tm_mon
  valid_tm_wday

android-14+
  __libc_android_log_assert
  __libc_android_log_print
  __libc_android_log_vprint

android-17+
  dlmalloc_walk_free_pages
  dlmalloc_walk_heap
  __get_pc

android-18+
  __get_res_cache
  __libc_init_common
  __libc_preinit

Change-Id: Ie67acf115427e808dde0e33411671b07a888a9b6
34 files changed