update and enhance afl++

[vanhauser-thc]

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The afl++ setup is a) very old and b) is using an absolutely outdated llvm which results in enhanced features of afl++ not being enabled. that makes comparisons with afl++ pretty pointless. Additionally I enhanced the configuration as it was not optimal.

The changes I made make afl++ easily to update to feature versions.

For PHP I had to make a small change to make it compile, it does not impact other fuzzers. For Popper I had some issue building and enabled verbose mode to see what is exactly failing. As I think this is useful I kept this in.

[adrianherrera]

Wooo cool, I'll try have a look over the Easter break 🐣