package/janus-gateway: bump version to 0.8.1

Other changes:
  - Update License hash which properly adds the OpenSSL exception.

Tested with Debian 8:

br-arm-full [1/6]: OK
br-arm-cortex-a9-glibc [2/6]:   OK
 br-arm-cortex-m4-full [3/6]:   SKIPPED
        br-x86-64-musl [4/6]:   OK
    br-arm-full-static [5/6]:   SKIPPED
          sourcery-arm [6/6]:   OK

Signed-off-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>