Remove the unused method PackFile.hasExt().

It will be used in a future change, so just include it with that change.

Change-Id: I7db28d86f8e8b282a403acd9a4c4defaae828f94

org.eclipse.jgit/src/org/eclipse/jgit/storage/file/PackFile.java

@@ -97,8 +97,6 @@ public class PackFile implements Iterable<PackIndex.MutableEntry> {
 
 	private final File packFile;
 
-	private final int extensions;
-
 	private File keepFile;
 
 	private volatile String packName;
@@ -146,7 +144,6 @@ public class PackFile implements Iterable<PackIndex.MutableEntry> {
 	public PackFile(final File packFile, int extensions) {
 		this.packFile = packFile;
 		this.packLastModified = (int) (packFile.lastModified() >> 10);
-		this.extensions = extensions;
 
 		// Multiply by 31 here so we can more directly combine with another
 		// value in WindowCache.hash(), without doing the multiply there.
@@ -1090,8 +1087,4 @@ public class PackFile implements Iterable<PackIndex.MutableEntry> {
 		String b = (dot < 0) ? p : p.substring(0, dot);
 		return new File(packFile.getParentFile(), b + '.' + ext.getExtension());
 	}
-
-	private boolean hasExt(PackExt ext) {
-		return (extensions & ext.getBit()) != 0;
-	}
 }