Update quickstarts (including MP) to use new GraalVM 20 docker image.

[barchetta]

SE and MP native builds on local machine work AOK.
SE native build in Docker works AOK.
MP native build in Docker getting an error:

[WARNING] com.oracle.svm.core.util.UserError$UserException: 
Class initialization of sun.java2d.cmm.lcms.LCMSTransform failed. 
Use the option --initialize-at-run-time=sun.java2d.cmm.lcms.LCMSTransform to explicitly request delayed initialization of this class.
[WARNING] Detailed message:
...
Caused by: com.oracle.graal.pointsto.constraints.UnsupportedFeatureException: 
Class initialization of sun.java2d.cmm.lcms.LCMSTransform failed. 
Use the option --initialize-at-run-time=sun.java2d.cmm.lcms.LCMSTransform to explicitly request delayed initialization of this class.
...
Caused by: java.lang.UnsatisfiedLinkError: no lcms in java.library.path: [/usr/java/packages/lib, /usr/lib64, /lib64, /lib, /usr/lib]

So maybe need to add the lcm package to the docker image.

[romain-grecourt]

Do you want to fix the lcm lib issue first ?

[barchetta]

Yes. It looks like we remove liblcms on minimization. Will fix that.

[barchetta]

liblcms issue fixed in PR #1577. New Docker image has been pushed.
MP native image now builds, but at runtime hits issue #1578