external: Get builds working for all architectures

Update openconnect/ to fix the MIPS build.  Get rid of armeabi-v7a as
those devices will fall back to the armeabi (ARMv5) binaries.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
libs: Sync binaries with the latest openconnect source tree

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>