Silence non-externalized String warning

Change-Id: I647a7f6fc24e3042baaa302a54cf34e4a8d59fc9

Author: msohn

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

@@ -189,7 +189,7 @@ private static PackExt getPackExt(String endsWithExtension) {
 				return ext;
 			}
 
-			if (endsWithExtension.equals("old-" + ext.getExtension())) {
+			if (endsWithExtension.equals("old-" + ext.getExtension())) { //$NON-NLS-1$
 				return ext;
 			}
 		}

org.eclipse.jgit/src/org/eclipse/jgit/transport/PushCertificateParser.java

@@ -375,7 +375,7 @@ receivedNonce, sentNonce(), db, stateless, nonceSlopLimit)
 			// Read push-option lines (if any) before the empty line separator
 			String line;
 			while (!(line = reader.read()).isEmpty()) {
-				if (line.startsWith(PUSH_OPTION + " ")) {
+				if (line.startsWith(PUSH_OPTION + " ")) { //$NON-NLS-1$
 					pushOptions.add(parseHeader(line, PUSH_OPTION));
 				} else {
 					// Not a push-option, should be empty line