Enforce 64-bit build environment

We will only support 64-bit build environment beyond froyo/2.2 .

Change-Id: I71eb1230bf0bc12ccde2aeda6255db6a87540437
diff --git a/core/find-jdk-tools-jar.sh b/core/find-jdk-tools-jar.sh
index 4c40627..f555576 100755
--- a/core/find-jdk-tools-jar.sh
+++ b/core/find-jdk-tools-jar.sh
@@ -3,7 +3,7 @@
 else
     JAVAC=$(which javac)
     if [ -z "$JAVAC" ] ; then
-	echo "Please-install-JDK-5.0,-update-12-or-higher,-which-you-can-download-from-java.sun.com"
+	echo "Please-install-JDK-6,-which-you-can-download-from-java.sun.com"
 	exit 1
     fi
     while [ -L $JAVAC ] ; do