javabridge/locate.py: improve Linux jdk check
javabridge/locate.py: improve Linux jdk check

The check for Linux implicitly relies on /usr/bin/java pointing to an
OpenJDK version. Now checks for an Oracle JDK and uses the proper
directories if found.

CellProfiler/python-javabridge,CellProfiler/python-javabridge,CellProfiler/python-javabridge,CellProfiler/python-javabridge