android: Catch OutOfMemoryError when importing profiles

Not sure if this is actually caused because e.g. the file is too large
or due to some encoding issue.

src/frontends/android/app/src/main/java/org/strongswan/android/ui/VpnProfileImportActivity.java

@@ -65,6 +65,7 @@ import java.io.ByteArrayOutputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
+import java.lang.OutOfMemoryError;
 import java.net.URL;
 import java.net.UnknownHostException;
 import java.security.KeyStore;
@@ -714,9 +715,16 @@ public class VpnProfileImportActivity extends AppCompatActivity
 				}
 			}
 			if (in != null)
+			{
+				try
 				{
 					result.Profile = streamToString(in);
 				}
+				catch (OutOfMemoryError e)
+				{	/* just use a generic exception */
+					result.ThrownException = new RuntimeException();
+				}
+			}
 			return result;
 		}