elfutils: 0.166 -> 0.168

- Backport patches from debian to 0.168 and add US tags.

- Rebase 0001-build-Provide-alternatives-for-glibc-assumptions-hel.patch to support libc musl

(From OE-Core rev: 13e5819dc4ef44d99d0f22686365fd3c988d6bce)

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

meta/recipes-devtools/elfutils/elfutils-0.168/fixheadercheck.patch

@@ -0,0 +1,23 @@
+For some binaries we can get a invalid section alignment, for example if 
+sh_align = 1 and sh_addralign is 0. In the case of a zero size section like 
+".note.GNU-stack", this is irrelavent as far as I can tell and we shouldn't
+error in this case.
+
+RP 2014/6/11
+
+Upstream-Status: Pending
+
+diff --git a/libelf/elf32_updatenull.c b/libelf/elf32_updatenull.c
+--- a/libelf/elf32_updatenull.c
++++ b/libelf/elf32_updatenull.c
+@@ -339,8 +339,8 @@ __elfw2(LIBELFBITS,updatenull_wrlock) (Elf *elf, int *change_bop, size_t shnum)
+ 		     we test for the alignment of the section being large
+ 		     enough for the largest alignment required by a data
+ 		     block.  */
+-		  if (unlikely (! powerof2 (shdr->sh_addralign))
+-		      || unlikely ((shdr->sh_addralign ?: 1) < sh_align))
++		  if (shdr->sh_size && (unlikely (! powerof2 (shdr->sh_addralign))
++		      || unlikely ((shdr->sh_addralign ?: 1) < sh_align)))
+ 		    {
+ 		      __libelf_seterrno (ELF_E_INVALID_ALIGN);
+ 		      return -1;