"make check" fails in fileutils-4.1 if SIMPLE_BACKUP_SUFFIX in env

[Duncan Roe]

Hi,

fileutils/fileutils-4.1/tests/cp/backup-is-src doesn't take account that the
user might have SIMPLE_BACKUP_SUFFIX in the environment: "make check" fails in
this case.

Because it's only the shell script's environment, I think it should be OK to
simply remove SIMPLE_BACKUP_SUFFIX, as in the attached patch.

It's not a simple job to replace ~ with a shell variable in this script because
of the <<\EOF

Cheers ... Duncan.

patch_for_cp
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