package/waffle: bump version to 1.6.1

package/waffle: bump version to 1.6.1

Release notes for v1.6.1:
https://lists.freedesktop.org/archives/mesa-announce/2020-March/000575.html

Removed patch 0001 which was applied upstream.

Switched _SITE to gitlab according to release notes for v1.6.0:
https://lists.freedesktop.org/archives/mesa-announce/2019-June/000520.html

Added -Dwaffle_has_nacl=OFF to CONF_OPTS to disable nacl support, this
avoids adding a dependency to C++:
https://gitlab.freedesktop.org/mesa/waffle/-/commit/6ca943584e593aec2bd4f9c66d91859e63e02d61#9a2aa4db38d3115ed60da621e012c0efc0172aae_27_26

Added support for mesa3d surfaceless egl:
https://gitlab.freedesktop.org/mesa/waffle/commit/7318f22c4761035c03e99420edf3e92f07e06c9c

Added support for bash-completion:
https://gitlab.freedesktop.org/mesa/waffle/-/blob/maint-1.6/CMakeLists.txt#L189

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>