diff: Import fixes from OpenBSD

original commit log by miller@OpenBSD r1.46:
Fix exit value when diffing directories with missing files and the -N
or -P options are not used. From Ibrahim Khalifa

Fix exit status with -rq when there is a file in one directory but not another,
i.e., when print_only is called.

Prior to this change, -rq was always returning 0. After this change it will
return 1

Fix exit status with -rq when there is a file in one directory but not another,
i.e., when print_only is called.

Prior to this change, -rq was always returning 0. After this change it will
return 1 if there is a difference between two directories.

This fixes compatibility with GNU diff and unbreaks backwards compatibility
expectations.

Found when trying to extend diff_test:brief_format_test.

MFC after: 2 months
MFC with: r321076, r321077

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Clean up headers declaration

Fix building with recent gcc

Reported by: lwhsu, ngie

Import diff from OpenBSD and remove GNU diff

Some of the modifications from the previous summer of code has been integrated
Modification for compatibility with GNU diff output has been added

Main d

Import diff from OpenBSD and remove GNU diff

Some of the modifications from the previous summer of code has been integrated
Modification for compatibility with GNU diff output has been added

Main difference with OpenBSD:
Implement multiple GNU diff options:
* --ignore-file-name-case
* --no-ignore-file-name-case
* --normal
* --tabsize
* --strip-trailing-cr
Make diff -p compatible with GNU diff
Implement diff -l
Make diff -r compatible with GNU diff

Capsicumize diffing 2 regular files
Add a simple test suite

Approved by: AsiaBSDcon devsummit
Obtained from: OpenBSD, GSoC
Relnotes: yes

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