Bug#739186: inventor: FTBFS on s390x: error: cast from 'void*' to 'int' loses precision [-fpermissive]

[Graham Inggs]

I recently received a notification that inventor also FTBFS on arm64
in Ubuntu Trusty, buildlog [1].
Inventor wasn't built for Ubuntu Saucy as tcsh was not available, buildlog [2].

Could this fix be extended to include __arm64__ as well, please?

[1] https://launchpadlibrarian.net/171094762/buildlog_ubuntu-trusty-arm64.inventor_2.1.5-10-17ubuntu1_FAILEDTOBUILD.txt.gz
[2] https://launchpadlibrarian.net/153838803/buildlog_ubuntu-saucy-arm64.inventor_2.1.5-10-17ubuntu1_MANUALDEPWAIT.txt.gz