Fix sdnc dgbuilder build failure

ant reports build_pom_for_yang_compile as invalid
command on windows as ant plugin consider it as native
command. executable directive make it explicit.

Change-Id: I25d202eafeda6102cba38bd12e78a1d2a617e785
Signed-off-by: Kanagaraj Manickam <kanagaraj.manickam@huawei.com>

Former-commit-id: 7e56426b59afa7866cd28a04efc6e133907d625d
diff --git a/dgbuilder/pom.xml b/dgbuilder/pom.xml
index 0b5386d..6c4f758 100644
--- a/dgbuilder/pom.xml
+++ b/dgbuilder/pom.xml
@@ -117,11 +117,11 @@
 					<execution>
 					<phase>generate-sources</phase>
 					<configuration>
-					<tasks>
-						<exec executable="${project.basedir}/build_pom_for_yang_compile">
-							<arg value="${project.parent.version}"/>
-						</exec>
-					</tasks>
+						<workingDirectory>"${project.basedir}"</workingDirectory>
+						<executable>build_pom_for_yang_compile</executable>
+						<arguments>
+							<argument>"${project.parent.version}"</argument>
+						</arguments>
 					</configuration>
 					<goals>
 						<goal>run</goal>