Add architecture ppc64le to travis build

[zazzel]

Hi,
I had added ppc64le support on Travis-ci and Its been success added and build. Kindly review and merge same.

Changes done are added ppc64le arch and exclude LUANAME=luajit-2.0 since its not supporting ppc64le Arch.

The Travis ci build logs can be verified from the link below.
https://travis-ci.com/github/zazzel/lgi/builds/206977452
Please have a look.

Thank you

[psychon]

Hi,

thanks a lot for this PR.

However, I have to ask: Sorry, but what is the motivation for this? For example, one could add a Travis build with a big endian architecture because big endian causes much problems / has much differences. Or a reason could be "there were a couple of times where problems for ppc64 slipped through / could have been caught by CI". Is there something like this? Or are you just adding this PR "because".

My main issue with Travis in recent times has been build time. It only runs 3(?) jobs in parallel.
Random data point:

• https://travis-ci.org/github/pavouk/lgi/builds/673164708 says "Total time 3 min 7 sec"
• https://travis-ci.com/github/zazzel/lgi/builds/206977452 says "Total time 7 min 47 sec"

[zazzel]

Hi Team,
This PR adds CI support for the IBM Power Little Endian (ppc64le) architecture. The idea is to ensure that the builds on this architecture are continuously tested along with the Intel builds (amd64) as this is part of the ubuntu distro on that architecture as well and detecting (and fixing) any issues or failures early would help to ensure that we are always up to date.
Thank you