package/binutils: add binutils 2.26

package/binutils: add binutils 2.26

- Rebase patches from 2.25 on top of 2.26.
- Use git format for patches
- remove upstreamed xtensa patches

The first patch [1] is needed to be able to build glibc with binutils 2.26 on nios2.
The second from [2] fix an assertion issue with ld.

[1] https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commitdiff;h=a7be2893a6449e64fe6cfcdd8700b0a367a69f19
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=19405

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>