Fix: retry command substitution on Windows.

[dblock]

Signed-off-by: dblock dblock@dblock.org

Description

Before:

2021-10-25 23:27:37 ERROR    Error building common-utils, retry with: ./src/run_build.py manifests/1.1.0/opensearch-1.1.0.yml --component common-utils --snapshot

After:

2021-10-26 00:23:48 ERROR    Error building common-utils, retry with: ./build.sh manifests/1.1.0/opensearch-1.1.0.yml --component common-utils --snapshot

On Windows, because we always run under bash the paths in these messages are unix, not Windows.

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