libudev-compat: fcntl definitions missing on older glibc

[tilt12345678]

building libudev-compat fails on amd64 libc 2.13 (wheezy) with
MAX_HANDLE_SZ undefined
struct file_handle resolves to incomplete type
this is just jused for the definition of file_handle_union, which in turn appears not to be used in libudev-compat.
i got it to compile anyhow by adding the missing definitions according to a libc version 2.19 fcntl bits/fcntl-linux.h see 7104a1b for details
hooray ;-) but probably it was smarter to just delete the offending code

[jcnelson]

Heh, this is because libudev-compat was forked from systemd's libudev 219, so it doesn't surprise me that there are bits that won't compile on Wheezy. If you send me your diff as a PR I'd be happy to merge it :).

In general, I'm in favor of making changes like the one you proposed instead of removing code, since I'd like to keep libudev-compat's code as close as possible to libudev's. This makes it easier for me to keep libudev-compat's API in sync with libudev's.