elfutils: update 0.185 -> 0.186

Drop glibc-2.34-fix.patch merged upstream.

Rework support for error() on non-glibc targets:
upstream now provides its own implementation, so we can drop
the patch that adds ours; said implementation isn't
build-tested with tests, so ptest has to be disabled on musl.
This, in turns, allows dropping 0004-Fix-error-on-musl.patch.

License-Update: copyright years
(From OE-Core rev: 9c51ae20c0e4c0d3e7161fc6b51fca078dbf014a)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/elfutils/files/0003-musl-utils.patch

@@ -1,4 +1,4 @@
-From 2f94d488bf3daaa6a8548ee77120fc2506a9bbe3 Mon Sep 17 00:00:00 2001
+From 934d21dc0b06b95c7c65cb29c5096decd91d4d5f Mon Sep 17 00:00:00 2001
 From: Hongxu Jia <hongxu.jia@windriver.com>
 Date: Fri, 23 Aug 2019 10:19:48 +0800
 Subject: [PATCH] musl-utils
@@ -57,7 +57,7 @@ index 2c6d91b..608646e 100644
  ARGP_PROGRAM_VERSION_HOOK_DEF = print_version;
  
 diff --git a/src/strip.c b/src/strip.c
-index 70fc8c0..d035d9e 100644
+index d5b753d..d6e1b64 100644
 --- a/src/strip.c
 +++ b/src/strip.c
 @@ -46,6 +46,13 @@
@@ -75,7 +75,7 @@ index 70fc8c0..d035d9e 100644
  
  /* Name and version of program.  */
 diff --git a/src/unstrip.c b/src/unstrip.c
-index e488e81..0e44456 100644
+index aacc9aa..5e71290 100644
 --- a/src/unstrip.c
 +++ b/src/unstrip.c
 @@ -52,6 +52,15 @@