[Bug 210607] patch to bin/cat/cat.c to align output between when invoked with -be & -ne flags

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210607

            Bug ID: 210607
           Summary: patch to bin/cat/cat.c to align output between when
                    invoked with -be & -ne flags
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: venture37 at geeklan.co.uk

Created attachment 171845
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=171845&action=edit
patch cat.c & ATF tests

The attached patch amends bin/cat/cat.c so the output is the same aside
from blank lines being numbered or unnumbered, depending on whether cat
was invoked with -ne or -be.

At present, when cat is invoked with -be, there is an aditional
difference that the '$' on blank lines is placed on the far left of the
output.

The patch originates from r1.17 of bin/cat/cat.c from NetBSD.

Additionally, the ATF test is amended to test for the behaviour correctly (the
test previously only checked if text was aligned, without blank lines where the
issue being  tested for was present). This change is present upstream but
provided here in case a vendor import is not feasible at this time.

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