Check for statx support

Merged Jean Bez requested to merge statx-glibc into master

I was testing the new version of master with statx and it failed in my machine.

Looking at the documentation:

statx() was added to Linux in kernel 4.11; library support was added
       in glibc 2.28.

I have kernel 5.3.0-51-generic with ldd (Ubuntu GLIBC 2.27-3ubuntu1) 2.27.

I've included some #ifdefs to check for support for statx.

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