HPCC-10239 Windows Build break in WsDeploy

DeployUtils file confighelper.cpp class "CConfigHelper" is called from
WsDeploy, but it is not exported from the dll. This fix adds the
DEPLOYUTILS_API define to the class definition so it gets exported

Signed-off-by: William Whitehead <william.whitehead@lexisnexis.com>
Merge pull request #5012 from RussWhitehead/deployUtils

HPCC-10239 Windows Build break in WsDeploy

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>