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>

deployment/deployutils/confighelper.hpp

@@ -1,6 +1,6 @@
 #include "deployutils.hpp"
 
-class CConfigHelper
+class DEPLOYUTILS_API CConfigHelper
 {
 public: