Update BUILDING.txt (#3811)

java-8-openjdk become openjdk-8-jdk (see both ubuntu and debian package's name)

Reviewed-by: Ayush Saxena <ayushsaxena@apache.org>

BUILDING.txt

@@ -57,7 +57,7 @@ Refer to  dev-support/docker/Dockerfile):
 
 * Open JDK 1.8
   $ sudo apt-get update
-  $ sudo apt-get -y install java-8-openjdk
+  $ sudo apt-get -y install openjdk-8-jdk
 * Maven
   $ sudo apt-get -y install maven
 * Native libraries