6900341: jaxp/jaxws ant scripts using ant runtime in classpath, needs to be explicit

Reviewed-by: tbell
diff --git a/jaxp/build.properties b/jaxp/build.properties
index 9e5f633..f31b405 100644
--- a/jaxp/build.properties
+++ b/jaxp/build.properties
@@ -34,6 +34,10 @@
 # one of the standard user build.properties files (see build.xml)
 javac.jar=${bootstrap.dir}/lib/javac.jar
 
+# The tools.jar is needed in the classpath to compile these sources
+jdk.home=${java.home}/..
+tools.jar=${jdk.home}/lib/tools.jar
+
 # options for the <javac> tasks used to compile the tools
 javac.source = 7
 javac.target = 7