Avoid ByteBuffer incompatibility when compiling with JDK9+

Like MRESOLVER-85 and similar, the java implementation suffers from a compatibility break since java 9. The problem can be seen in the PR for AVRO-2603, https://github.com/apache/avro/pull/706, which fails for JAVA 11, but not for 8.

The error is:

Caused by: java.lang.NoSuchMethodError: java.nio.ByteBuffer.limit(I)Ljava/nio/ByteBuffer;
  [py-test] 	at org.apache.avro.io.BinaryDecoder.readBytes(BinaryDecoder.java:317)

• This should not occur when artifacts are compiled with JDK8, even if run in Java 11 runtime. i.e., This shouldn't be a big issue while maven artifacts are being published with JDK8 (the lowest Java runtime version we support).
• Likewise, this should not occur when artifacts are compiled with JDK11 (with -target 1.8) and run in a Java 11 runtime, as with the JAVA=11 build targets.
• This will occur when the artifacts are compiled with JDK11 (with -target 1.8) and run in a Java 8 runtime.
• It will be important to fix when Avro publishes artifacts built with JDK11 and JDK8 is still meant to be supported.