3256aba6a2
Without the change the build fails for me as:
../unix/file-descriptor.cc:404:70: error: 'RESOLVE_BENEATH' was not declared in this scope
404 | dirFd, path.rel_c_str(), flags, static_cast<uint64_t>(mode), RESOLVE_BENEATH | RESOLVE_NO_SYMLINKS);
| ^~~~~~~~~~~~~~~
This happens for 2 reasons:
1. `__NR_openat2` constant was not pulled in from the according headers
and as a result `<linux/openat2.h>` was not included.
2. `define HAVE_OPENAT2 0` build is broken: refers to missing
`RESOLVE_BENEATH` normally pulled in from `<linux/openat2.h>`
This changes fixes both.
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