clean up debug messages

Author: stooke

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/util/EnvVariableUtils.java

@@ -51,8 +51,6 @@ private static Set<String> getRequiredEnvVariableKeys() {
         if (OS.WINDOWS.isCurrent()) {
             requiredEnvVariableKeys.addAll(REQUIRED_ENV_VARIABLE_KEYS_WINDOWS);
         }
-        System.out.printf("XXX cout reuired var= %s\n", requiredEnvVariableKeys);
-        System.err.printf("XXX cerr reuired var= %s\n", requiredEnvVariableKeys);
         return requiredEnvVariableKeys;
     }
 
@@ -89,15 +87,13 @@ public static boolean isKeyRequired(String key) {
 
         private static String mapKey(String key) {
             if (OS.WINDOWS.isCurrent()) {
-                System.err.println("XXX ROOT mapKey " + key + " to " + key.toUpperCase(Locale.ROOT));
                 return key.toUpperCase(Locale.ROOT);
             }
             return key;
         }
 
         private static boolean isKeyRequiredCondition(String key) {
             // LC_* are locale vars that override LANG for specific categories (or all, with LC_ALL)
-            System.err.println("XXX cerr key " + key + " req=" + REQUIRED_ENV_VARIABLE_KEYS.contains(key));
             return REQUIRED_ENV_VARIABLE_KEYS.contains(key) || key.startsWith("LC_");
         }
     }