Fix versioned GCC detection

[ghedo]

Basically this fixes "make depend" when using e.g. "CC=gcc-5" and also makes Travis run "make depend".

[ghedo]

@ekasper seems that your commit 58dd1ce broke this, so you might want to take a look to see if my fix is ok.

@levitte I'm not sure if running make depend on Travis is the right thing, care to comment?

[levitte]

Running make depend is only strictly necessary if you do repeated updates and builds in the same directory. Since travis builds always starts with a clean dir, a make depend isn't necessary there.

[ghedo]

@levitte yes, but with the recent build changes we always get the "you must run make depend" message even on Travis: https://travis-ci.org/openssl/openssl/jobs/102411115#L6185

Maybe it's a separate bug...

[ghedo]

Also, IIRC @richsalz mentioned somewhere that running "make depend" is mandatory now (or did I just imagine it?), maybe I should have asked him instead :)

[levitte]

We are a bit over the top there, it's true... I did see it as mandatory just a few days ago, but then realised that for those who just download, unpack, build, test and install and then don't touch it any more, that's strictly speaking not true.

... I'm way too sleepy to do anything about it now, but if noone gets there before me, I might think of some way to reword that "error" message tomorrow...

[levitte]

What really is mandatory is to run config or Configure... I've come to understand that there were some who skipped that step (don't ask me how).

[ghedo]

Ok, thanks. We might still want to run it on Travis for testing purposes though (e.g. doing that wold have caught the error I got when running make depend with CC=gcc-6 much sooner).

[ekasper]

@ghedo - I can't quite follow how my commit broke it; it would seem that makedepend detection was already broken before that, because it's testing for equality with "gcc". Anyway, fix seems reasonable, @levitte is the best person to approve the MR.

[ghedo]

@ekasper hmmm, you are right, I don't remember my original thought process, I guess I was just too quick to jump to conclusions, sorry :/

[ghedo]

@levitte ping? should I just remove the "make depend on Travis" commit?

[richsalz]

wait a bit for my "remove clean-depend" change to land, and let's see if this is still needed.

[ghedo]

This is fixed in master now.