Don't compile custom u8g without DOGLCD

Marlin/src/lcd/dogm/u8g_dev_ssd1306_sh1106_128x64_I2C.cpp

  * beginning.
  */
 
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(DOGLCD)
+
 #include <U8glib.h>
 #include "HAL_LCD_com_defines.h"
 
   return 1;
 }
 
+#endif // DOGLCD

Marlin/src/lcd/dogm/u8g_dev_st7565_64128n_HAL.cpp

 
 */
 
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(DOGLCD)
+
 #include <U8glib.h>
 
 #include "HAL_LCD_com_defines.h"
 
 
 U8G_PB_DEV(u8g_dev_st7565_64128n_HAL_hw_spi, WIDTH, HEIGHT, PAGE_HEIGHT, u8g_dev_st7565_64128n_HAL_fn, U8G_COM_HAL_HW_SPI_FN);
-u8g_dev_t u8g_dev_st7565_64128n_HAL_2x_hw_spi = { u8g_dev_st7565_64128n_HAL_2x_fn, &u8g_dev_st7565_64128n_HAL_2x_pb, U8G_COM_HAL_HW_SPI_FN };
+u8g_dev_t u8g_dev_st7565_64128n_HAL_2x_hw_spi = { u8g_dev_st7565_64128n_HAL_2x_fn, &u8g_dev_st7565_64128n_HAL_2x_pb, U8G_COM_HAL_HW_SPI_FN };
+
+#endif // DOGLCD

Marlin/src/lcd/dogm/u8g_dev_st7920_128x64_HAL.cpp

 
 */
 
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(DOGLCD)
+
 #include <U8glib.h>
 
 #include "HAL_LCD_com_defines.h"
   // for the ST7920 for HAL systems no matter what is selected in ultralcd_impl_DOGM.h.
   u8g_dev_t u8g_dev_st7920_128x64_rrd_sw_spi = { u8g_dev_st7920_128x64_HAL_4x_fn, &u8g_dev_st7920_128x64_HAL_4x_pb, U8G_COM_ST7920_HAL_SW_SPI };
 #endif
+
+#endif // DOGLCD

Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.cpp

 // NOTE - the HAL version of the rrd device uses a generic ST7920 device.  See the
 // file u8g_dev_st7920_128x64_HAL.cpp for the HAL version.
 
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(DOGLCD)
+
 #ifndef U8G_HAL_LINKS
 
-#include "../../Marlin.h"
+//#include "../../Marlin.h"
 
 //#if ENABLED(U8GLIB_ST7920)
 //#if ( ENABLED(SHARED_SPI) || !ENABLED(SHARED_SPI) && (defined(LCD_PINS_D4) &&  LCD_PINS_D4 >= 0) &&  (defined(LCD_PINS_ENABLE) &&  LCD_PINS_ENABLE >= 0))
   #define U8G_DELAY() u8g_10MicroDelay()
 #endif
 
-
-
 static void ST7920_WRITE_BYTE(uint8_t val) {
   for (uint8_t i = 0; i < 8; i++) {
     WRITE(ST7920_DAT_PIN, val & 0x80);
     WRITE(ST7920_CLK_PIN, HIGH);
     WRITE(ST7920_CLK_PIN, LOW);
-    val = val << 1;
+    val <<= 1;
   }
 }
 
-
 #define ST7920_SET_CMD()         { ST7920_WRITE_BYTE(0xF8); U8G_DELAY(); }
 #define ST7920_SET_DAT()         { ST7920_WRITE_BYTE(0xFA); U8G_DELAY(); }
 #define ST7920_WRITE_NIBBLES(a)     { ST7920_WRITE_BYTE((uint8_t)((a)&0xF0u)); ST7920_WRITE_BYTE((uint8_t)((a)<<4u)); U8G_DELAY(); }
 #define ST7920_CS()              { WRITE(ST7920_CS_PIN,1); U8G_DELAY(); }
 #define ST7920_NCS()             { WRITE(ST7920_CS_PIN,0); }
 
-
-
 uint8_t u8g_dev_rrd_st7920_128x64_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg) {
   uint8_t i, y;
   switch (msg) {
     case U8G_DEV_MSG_INIT: {
       OUT_WRITE(ST7920_CS_PIN, LOW);
-
-
-        OUT_WRITE(ST7920_DAT_PIN, LOW);
-        OUT_WRITE(ST7920_CLK_PIN, LOW);
+      OUT_WRITE(ST7920_DAT_PIN, LOW);
+      OUT_WRITE(ST7920_CLK_PIN, LOW);
 
       ST7920_CS();
       u8g_Delay(120);                 //initial delay for boot up
 
 //#endif //( ENABLED(SHARED_SPI) || !ENABLED(SHARED_SPI) && (defined(LCD_PINS_D4) &&  LCD_PINS_D4 >= 0) &&  (defined(LCD_PINS_ENABLE) &&  LCD_PINS_ENABLE >= 0))
 //#endif // U8GLIB_ST7920
-#endif // AVR
+
+#endif // U8G_HAL_LINKS
+
+#endif // DOGLCD