Bug 578166 - Signing information apparent in the Plug-ins tab of the
About dialog

We should use the canonical representation of the file to ensure that
things like ".." are removed from the path.

Change-Id: I346fb28f2035292705aeb1d0f49a6601f4e09d58
Signed-off-by: Ed Merks <ed.merks@gmail.com>
Reviewed-on: https://git.eclipse.org/r/c/equinox/rt.equinox.p2/+/190783