elfutils: clean up patches

In the upgrade a large number of Upstream-Status tags were dropped, so add them
back.  I'm taking the stand that copying a patch Debian is carrying doesn't
count as a backport.

Remove two Debian-specific patches (one for Hurd, one for kfreebsd) so
we're not carrying useless patches.

Remove two patches that are no longer applied.

(From OE-Core rev: b039b26958655aab496b588f4e41a5dea1bfaac1)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/elfutils/files/debian/kfreebsd_path.patch

@@ -1,17 +0,0 @@
-Index: b/tests/run-native-test.sh
-===================================================================
---- a/tests/run-native-test.sh
-+++ b/tests/run-native-test.sh
-@@ -77,6 +77,12 @@ native_test()
-   test $native -eq 0 || testrun "$@" -p $native > /dev/null
- }
- 
-+# On the Debian buildds, GNU/kFreeBSD linprocfs /proc/$PID/maps does
-+# not give absolute paths due to sbuild's bind mounts (bug #570805)
-+# therefore the next two test programs are expected to fail with
-+# "cannot attach to process: Function not implemented".
-+[ "$(uname)" = "GNU/kFreeBSD" ] && exit 77
-+
- native_test ${abs_builddir}/allregs
- native_test ${abs_builddir}/funcretval
-