Fix compilation errors for QEMU mode for recent glibc

[pietroferretti]

As explained in QEMU git commit 75e5b70e6b5dcc4f2219992d7cffa462aa406af0 (https://git.qemu.org/?p=qemu.git;a=commitdiff;h=75e5b70e6b5dcc4f2219992d7cffa462aa406af0), recent versions of the glibc add memfd_create, which creates conflicts at compile time for QEMU 2.10.

This can be fixed by adding a pair of patches when building QEMU with AFL support.

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Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[pietroferretti]

@googlebot I signed it!

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CLAs look good, thanks!

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CLAs look good, thanks!

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[Dor1s]

Thanks for the patch! It looks good to me. One question: would you be able to update https://github.com/google/AFL/blob/master/.travis.yml file so that it would also try building with QEMU support? That would be supper helpful.

[pietroferretti]

Sure, I added the QEMU build to Travis.

[Dor1s]

Awesome! Thanks a lot, @pietroferretti !