elfutils: 0.168 -> 0.170

elfutils: 0.168 -> 0.170

The 0.170 Fixed CVE issues
- CVE-2017-7608
- CVE-2017-7612
- CVE-2017-7611
- CVE-2017-7610
- CVE-2016-10255
- CVE-2017-7613
- CVE-2017-7609
- CVE-2016-10254
- CVE-2017-7607

Rebase patches to 0.170
- dso-link-change.patch -> 0001
- Fix_elf_cvt_gunhash.patch -> 0002
- fixheadercheck.patch -> 0003
- 0001-remove-the-unneed-checking.patch -> 0004
- 0001-fix-a-stack-usage-warning.patch -> 0005
- aarch64_uio.patch -> 0006
- shadow.patch -> 0007
- 0001-build-Provide-alternatives-for-glibc-assumptions-hel.patch -> 0008
- debian/mips_backend.diff -> debian/mips_backend.patch

Drop obsolete patches
- 0001-elf_getarsym-Silence-Werror-maybe-uninitialized-fals.patch
  Upstream fixed it
  https://sourceware.org/git/?p=elfutils.git;a=commit;h=7114c513fbebcca8b76796b7f64b57447ba383e1

- Fix_one_GCC7_warning.patch
  It is a backported patch
  https://sourceware.org/git/?p=elfutils.git;a=commit;h=93c51144c3f664d4e9709da75a1d0fa00ea0fe95

- Drop debian patches, they modify test case.
  debian/testsuite-ignore-elflint.diff
  debian/kfreebsd_path.patch
  debian/hurd_path.patch
  debian/ignore_strmerge.diff

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>