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When porting to cmake, accidentially the check for the chflags() function was overseen.
This check is now added with this PR.

This enables the build of the support of backup and restore of BSD File Flags:

In addition to file permissions, FreeBSD supports the use of "file flags". These flags add an additional level of security and control over files, but not directories. With file flags, even root can be prevented from removing or altering files.

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• Short description and the purpose of this PR is present above this paragraph
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Checklist for the reviewer of the PR (will be processed by the Bareos team)

General

• PR name is meaningful
• Purpose of the PR is understood
• Separate commit for this PR in the CHANGELOG.md, PR number referenced is same
• Commit descriptions are understandable and well formatted

Source code quality

• Source code changes are understandable
• Variable and function names are meaningful
• Code comments are correct (logically and spelling)
• Required documentation changes are present and part of the PR
• bareos-check-sources --since-merge does not report any problems
• git status should not report modifications in the source tree after building and testing

Tests

• Decision taken that a system- or unittest is required (if not, then remove this paragraph)
• The decision towards a systemtest is reasonable compared to a unittest
• Testname matches exactly what is being tested
• Output of the test leads quickly to the origin of the fault