add wtpcap build

releng.wtpbuilder/scripts/build/runbuild.xml

@@ -89,7 +89,8 @@
     </target>
     <target
         name="build"
-        depends="init">
+        depends="init"
+    	 if="doBuild">
 
 		<!--this property required as of Eclipse 3.0 stream builds > 20031126 -->
         <property
@@ -345,7 +346,11 @@
                 arg1="${buildType}"
                 arg2="N" />
         </condition>
-
+       
+    	<condition property="doBuild" >
+    	 <available resource="${wtp.builder.home}/components/${component}" type="dir" />
+    	</condition>
+    	
     </target>
     <target
         name="runEclipseBuild"