openssl-probe is triggering /boot automount on Linux

[cjmayo]

The inclusion of "/boot/system/data/ssl", for Haiku here:
https://github.com/alexcrichton/openssl-probe/blob/a014ef5d4dba06a497df0969823ace290b9dfcdd/src/lib.rs#L35
is causing /boot to be automounted on Linux systems with systemd automount for /boot.

Especially frequent as it is used by cargo --list which is run by the Bash autocomplete for cargo every time a new shell is started.
rust-lang/cargo#6737

[djc]

This was fixed in

• Security: reduce paths inspected on common OSes #31