do closefrom() on recent linux systems by using the native syscall, wrapped or not

[nedko]

close_range syscall was added to the Linux kernel in version 5.9
glibc got wrapper in its version 2.34

https://lkml.iu.edu/hypermail/linux/kernel/2008.0/02649.html
https://www.openwall.com/lists/musl/2022/08/18/5
https://gitlab.freedesktop.org/dbus/dbus/-/merge_requests/265
https://gitlab.freedesktop.org/dbus/dbus/-/issues/278

With commits 6c16b70 ( Fix "void value not ignored as it ought to be" error ), that adds libbsd-overlay pkg-config check, and 06cf8c6 ( Use pkg-config for libbsd-overlay and libevent ) the issue somewhat fixed.