[Toybox] fgetxattr with O_PATH

[enh]

https://android-review.googlesource.com/#/c/152663/

libc: Add O_PATH support for fgetxattr / fsetxattr Support O_PATH file
descriptors when handling fgetxattr and fsetxattr. This avoids requiring
file read access to pull extended attributes. This is needed to support
O_PATH file descriptors when calling SELinux's fgetfilecon() call. In
particular, this allows the querying and setting of SELinux file context by
using something like the following code: int dirfd = open("/path/to/dir",
O_DIRECTORY); int fd = openat(dirfd, "file", O_PATH | O_NOFOLLOW); char
*context; fgetfilecon(fd, &context); This change was motivated by a comment
in https://android-review.googlesource.com/#/c/152680/1/toys/posix/ls.c

-- 
Elliott Hughes - http://who/enh - http://jessies.org/~enh/
Android native code/tools questions? Mail me/drop by/add me as a reviewer.
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