Add GraalVM post installation message

(cherry picked from commit 989ed35)

Author: steve-s

mx.fastr/mx_fastr_dists.py

@@ -299,4 +299,17 @@ def mx_register_dynamic_suite_constituents(register_project, register_distributi
         'bin/R',
     ],
     include_in_polyglot=False,
+    post_install_msg="NOTES:\n---------------\n" +
+"Some R packages need a system-dependent configuration before they can be installed. " +
+"A generic configuration that works out of the box in most cases is provided by default. " +
+"If you wish to fine-tune the configuration to your system or should you encounter any " +
+"issues during R package installation, try running the following script that adjusts " +
+"the configuration to your system: \n" +
+"    ${graalvm_home}/jre/languages/R/bin/configure_fastr\n\n" +
+"The R component comes without native image by default. If you wish to build the native image, " +
+"which provides faster startup, but slightly slower peak performance, then run the following:\n" +
+"   ${graalvm_home}/jre/languages/R/bin/install_r_native_image\n\n" +
+"The native image is then used by default. Pass '--jvm' flag to the R or Rscript launchers to " +
+"use JVM instead of the native image.\n\n" +
+"See http://www.graalvm.org/docs/reference-manual/languages/r for more."
 ))

mx.fastr/suite.py

@@ -7,7 +7,7 @@
             {
                "name" : "truffle",
                "subdir" : True,
-               "version" : "205700799d38cc5adb239f5f6f1fce091b6cabb7",
+               "version" : "822da2f5e092931e236885be3cc6e9cac35b5c7a",
                "urls" : [
                     {"url" : "https://github.com/graalvm/graal", "kind" : "git"},
                     {"url" : "https://curio.ssw.jku.at/nexus/content/repositories/snapshots", "kind" : "binary"},