svm: adopt "JDK-8350703: Add standard system property stdin.encoding"

Author: zapster

docs/reference-manual/native-image/BuildOptions.md

@@ -163,6 +163,7 @@ The following system properties are automatically copied into the generated exec
 | native.encoding               | Specifies the host environment's character encoding               |
 | org.graalvm.nativeimage.kind  | Specifies if the image is built as a shared library or executable |
 | path.separator                | Path separator                                                    |
+| stdin.encoding                | Specifies the encoding for `System.in`                            |
 | stdout.encoding               | Specifies the encoding for `System.out` and `System.err`          |
 | sun.jnu.encoding              | Specifies encoding when parsing values passed via the commandline |
 

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/SystemPropertiesSupport.java

@@ -92,6 +92,7 @@ public abstract class SystemPropertiesSupport implements RuntimeSystemProperties
                     "native.encoding",
                     "stdout.encoding",
                     "stderr.encoding",
+                    "stdin.encoding",
     };
 
     /** System properties that are computed at run time on first access. */