fix JPEGDEC dependency

Author: eloquentarduino

src/eloquent_esp32cam/jpeg/JPEGDECWrapper.cpp

@@ -1,7 +1,9 @@
 #include <Arduino.h>
-#include <JPEGDEC.h>
 #include "JPEGDECWrapper.h"
 
+#if defined(__JPEGDEC__)
+#include <JPEGDEC.h>
+
 using Eloquent::Esp32cam::JPEG::JPEGDECWrapper;
 
 /**
@@ -22,4 +24,6 @@ int __handleMCU__(jpeg_draw_tag *mcu) {
     }
 
     return 1;
-}
+}
+
+#endif