Checking with both jdk-9+181_linux-x64_bin.tar.gz and
jre-9+181_linux-x64_bin.tar.gz as currently available at
<http://jdk.java.net/9/> "JDK 9 Early-Access Builds":

For one, make SunVersion::init understand <http://openjdk.java.net/jeps/223>
"JEP 223: New Version-String Scheme" at least insofar as to accept strings like
"9" with less than three dot-separated segments (where the missing segments are
treated like "0").

For another, at least for Linux x86-64, libjvm.so is now apparently located in a
path without an "amd64" architecture segment, "lib/server/libjvm.so".  (But
could that also be "client"?)  Other platforms may need further adjustments.

Change-Id: Idcebc833472c81a1dc74dcdd481b0a37274a8713