TransportHttp wrongly uses JDK 6 constructor of IOException

IOException constructor taking Exception as parameter is
new for JDK 6.

Change-Id: Iec349fc7be9e9fbaeb53841894883c47a98a7b29
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>

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

@@ -438,9 +438,9 @@ public class TransportHttp extends HttpTransport implements WalkTransport,
 			final HttpsURLConnection sslConn = (HttpsURLConnection) conn;
 			sslConn.setSSLSocketFactory(ctx.getSocketFactory());
 		} catch (KeyManagementException e) {
-			throw new IOException(e);
+			throw new IOException(e.getMessage());
 		} catch (NoSuchAlgorithmException e) {
-			throw new IOException(e);
+			throw new IOException(e.getMessage());
 		}
 	}