- Pull in libblkid for Linux in order to successfully build
- Fix PLIST.Linux: lib/hal -> libexec
- Remove Linux-only libusb buildlink. This version of hal fails to use libusb,
since it isn't version 2.0 (this does look a little like a mistake though).
- The CSR support is absent because libusb isn't available. Remove from
PLIST.Linux
- Other minor additions and edits to PLIST.Linux
- Buildlink in gperf explicitly, to reliably build the keymap support
- Make sure .../etc/udev/rules.d exists before trying to install to it
