Issue #6391: Fix tar.gz error on windows

[hlhoots]

PR for #6391
Fixes #6391

[LibbyBot]

Code analysis and actions

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• 1 product code files were changed.

• Please describe in a separate comment how you tested your changes.

• 1 FAT files were changed, added, or removed.

• Check that the build did not break the affected FAT suite(s).

[hlhoots]

#build

[LibbyBot]

Your personal build request is at https://wasrtc.hursley.ibm.com:9443/jazz/resource/itemOid/com.ibm.team.build.BuildResult/_e9A4QHANEemMj7NCS7eaxg

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[cbridgha]

Looks good

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Your Open Liberty build results are ready for viewing.

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[hlhoots]

#build

[LibbyBot]

Your personal build request is at https://wasrtc.hursley.ibm.com:9443/jazz/resource/itemOid/com.ibm.team.build.BuildResult/_6c0D8HDLEemMj7NCS7eaxg

Target locations of links might be accessible only to IBM employees.

[LibbyBot]

Your Open Liberty build results are ready for viewing.

• Unit test results are at http://public.dhe.ibm.com/ibmdl/export/pub/software/openliberty/runtime/personal/_6c0D8HDLEemMj7NCS7eaxg/junit/index.html.
• Gradle log and image zip are at http://public.dhe.ibm.com/ibmdl/export/pub/software/openliberty/runtime/personal/_6c0D8HDLEemMj7NCS7eaxg.

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The build hlhoots-7427-20190507-1438
https://wasrtc.hursley.ibm.com:9443/jazz/resource/itemOid/com.ibm.team.build.BuildResult/_6c0D8HDLEemMj7NCS7eaxg
completed and has errors or failures.

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[hlhoots]

build looked good. merging.