oath-toolkit: Update to version 2.6.11

oath-toolkit: Update to version 2.6.11

- Update from version 2.6.9 to 2.6.11
- Update of rootfile not required
- Changelog
    2.6.11
	** liboath: Handle invalid base32 encoded secrets.  Fixes: #41.
	   The gnulib update in version 2.6.10 made the base32 encoding functions
	   reject invalid encodings, but it appears as if these are wildly used.
	   We now accept invalid encodings again.  Thanks to Dorancé Martínez and
	   Seres Bendegúz for reports.
    2.6.10
	** Building from git uses a ./bootstrap script instead of 'make bootstrap'.
	** Build fixes for Windows.
	   In particular, don't use filenames "aux.h" and "aux.c" which interact
	   badly with the AUX special filename.
	** Build fixes for Arch Linux.
	** Various build fixes including updated gnulib files.
	   One remaining gnulib self-test disabled.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>