Add GO111MODULE=auto to GO_PKG_BUILD_VARS to allow the package to be
built in non-module mode.

Module-aware mode will be mandatory in the next golang release.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

Compiling cni failes due to MIPS16 somehow. Disable it.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

Thanks to @aparcar for help with porting this.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>