8073972: Deprecate Multi-Version Java Launcher (mJRE) for JDK8

Reviewed-by: alanb, iris, mchung

src/share/classes/sun/launcher/resources/launcher.properties

@@ -47,9 +47,13 @@ java.launcher.opt.footer     =\    -cp <class search path of directories and zip
 \                  enable verbose output\n\
 \    -version      print product version and exit\n\
 \    -version:<value>\n\
+\                  Warning: this feature is deprecated and will be removed\n\
+\                  in a future release.\n\
 \                  require the specified version to run\n\
 \    -showversion  print product version and continue\n\
 \    -jre-restrict-search | -no-jre-restrict-search\n\
+\                  Warning: this feature is deprecated and will be removed\n\
+\                  in a future release.\n\
 \                  include/exclude user private JREs in the version search\n\
 \    -? -help      print this help message\n\
 \    -X            print help on non-standard options\n\