Another fix to pass compile tests

Author: rsoric

src/Inkplate.h

@@ -101,12 +101,13 @@ class Inkplate : public System, public Graphics
     {
         return NetworkClient::isConnected();
     };
-    bool getNTPEpoch(time_t *timeEpoch, int timeZone = 0, char *ntpServer = "pool.ntp.org",
+    // The default parameters for nptServer here are cast to (char*) to keep the compiler happy
+    bool getNTPEpoch(time_t *timeEpoch, int timeZone = 0, char *ntpServer = (char *)"pool.ntp.org",
                      int daylightSavingsOffsetHours = 0)
     {
         return NetworkClient::getNTPEpoch(timeEpoch, timeZone, ntpServer, daylightSavingsOffsetHours);
     }
-    bool getNTPDateTime(tm *dateTime, int timeZone = 0, char *ntpServer = "pool.ntp.org",
+    bool getNTPDateTime(tm *dateTime, int timeZone = 0, char *ntpServer = (char *)"pool.ntp.org",
                         int daylightSavingsOffsetHours = 0)
     {
         return NetworkClient::getNTPDateTime(dateTime, timeZone, ntpServer, daylightSavingsOffsetHours);