[Bug 230049] OpenBSD diff (WITHOUT_GNU_DIFF) --strip-trailing-cr is incorrect

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230049

            Bug ID: 230049
           Summary: OpenBSD diff (WITHOUT_GNU_DIFF) --strip-trailing-cr is
                    incorrect
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: emacsray at gmail.com

% printf 'a\nb\r\nc\n' > a
% printf 'a\r\nb\r\nc\r\n' > b
% diff --strip-trailing-cr a b
...
@@ -1,3 +1,3 @@
 a
b
-c
+

GNU diff would report no difference.

The --strip-trailing-cr issue caused an LLVM test
test/MC/AsmParser/preserve-comments-crlf.s to fail.

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