Use Character.valueOf instead of new Character

Otherwise a new Character is allocated each time instead of
using the cache.

Change-Id: I648d0b012f66ba9dc46a37a390986f9c61e5a19c

org.eclipse.jgit/src/org/eclipse/jgit/ignore/IgnoreRule.java

@@ -105,7 +105,7 @@ public class IgnoreRule {
 
 		if (pattern.contains("*") || pattern.contains("?") || pattern.contains("[")) {
 			try {
-				matcher = new FileNameMatcher(pattern, new Character('/'));
+				matcher = new FileNameMatcher(pattern, Character.valueOf('/'));
 			} catch (InvalidPatternException e) {
 				e.printStackTrace();
 			}