MAPIMessage: skip UTF-8 in guess7bitEncoding because UTF-8 are never used as one-byte encoding in Outlook

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1172537 13f79535-47bb-0310-9956-ffa450edef68

src/scratchpad/src/org/apache/poi/hsmf/MAPIMessage.java

@@ -370,7 +370,10 @@ public class MAPIMessage extends POIDocument {
                   if(m.matches()) {
                      // Found it! Tell all the string chunks
                      String charset = m.group(1);
-                     set7BitEncoding(charset);
+
+                     if (!charset.equalsIgnoreCase("utf-8")) { 
+                        set7BitEncoding(charset);
+                     }
                      return;
                   }
                }