Added travisCI SIMDe example for arm64 + fix to Makefile for SIMDe

[mbrcic]

Reproductive command steps for arm64 minimap2 using SIMDe, as asked in:
#597

In process, I have fixed an error in Makefile.simde that probably appeared during the merge of previous PR.

[junaruga]

Thanks! awesome! Let's wait @lh3 's response.

[junaruga]

I think this line's syntax is wrong. You need -.

    - arch: arm64

[junaruga]

This is the result of the CI: https://travis-ci.org/github/lh3/minimap2/builds/685858196 . There are total 6 jobs. But it has to be total 7 jobs.

[mbrcic]

yeah, sorry, IDE issues :)

[mbrcic]

with that syntax mistake, the file is parsed in such a way that arm64 config takes only one (the last) variable values. you can check the parsed values with validator: https://config.travis-ci.com/explore
when that - is put in place, it parses well and there should be 7 tests.

[junaruga]

I did not know the config validation page. Thanks for sharing.
Yeah, now total 7 jobs here. https://travis-ci.org/github/lh3/minimap2/builds/685864104

[junaruga]

If we use name: syntax in .travis.yml, technically we can distinguish the similar jobs by the job names on the CI page. But I assume Heng likes the minimum config, and does not like the name syntax. So, maybe the current config is okay.

[mbrcic]

With this syntax mistake fixed, travisCI should do 7 tests, twice on arm64.

[junaruga]

I found the tailing space (tab) here. It's better to remove it.

[mbrcic]

Removed. Should this fixing commit be squashed as well?

[junaruga]

I think it's better to unify this PR's 2 commits to 1 commit by doing squash. (such as git rebase -i <commit hash>).