include: stick to a single version (2011) C/C++ atomics
This fixes mismatched binary interface when either: - the versions of C and C++ were different within the LibVLC build, or - an out-of-tree plugin used a different language versin than LibVLC. The LibVLC implementation for ISO C atomics with Intel intrinsics was not generally binary compatible with the native implementation of the compiler. In other words, only one atomics implementation can be used in one LibVLC installation. The One Definition Rule from C++ imposes that native implementation is used, so the LibVLC implementation is hereby removed. Regression from edf1c760.
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