Merge pull request #8176 from s-hadinger/display_compile

Fix compilation error when USE_DISPLAY without I2C or SPI

tasmota/xdsp_interface.ino

@@ -17,6 +17,7 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#if defined(USE_I2C) || defined(USE_SPI)
 #ifdef USE_DISPLAY
 
 #ifdef XFUNC_PTR_IN_ROM
@@ -137,3 +138,4 @@ bool XdspCall(uint8_t Function)
 }
 
 #endif  // USE_DISPLAY
+#endif  // USE_I2C or USE_SPI