add HPL easyconfig for ictce/6.3.5

@JackPerdue: let me make it easy on you w.r.t. my last remark in https://github.com/hpcugent/easybuild-easyconfigs/pull/944

If you merge this PR into your branch by clicking the shiny green button, it will be included in your open pull request.

I've tested the build of this HPL easyconfigs, works fine, so with this included, https://github.com/hpcugent/easybuild-easyconfigs/pull/944 is ready to go!

Thanks again for your contribution!