SKR 1.4 alert for unsupported LCD

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_4.h

@@ -250,7 +250,8 @@
     #define LCD_PINS_ENABLE                P1_23
     #define LCD_PINS_D4                    P1_21
 
-  #else
+  #elif HAS_GRAPHICAL_LCD
+
     #define BTN_ENC                        P0_28  // (58) open-drain
     #define LCD_PINS_RS                    P1_19
 
@@ -311,6 +312,10 @@
 
     #endif // !FYSETC_MINI_12864
 
+  #elif HAS_CHARACTER_LCD
+
+    #error "Character LCD not yet supported for SKR 1.4."
+
   #endif
 
 #endif // HAS_SPI_LCD