Merge pull request #9729 from Bob-the-Kuhn/U8G-compile-error-2.0.x

[2.0.x] Move #include <U8glib.h> in ultralcd_st7920_u8glib_rrd_AVR.cpp (fix bug introduced in PR #9624)

Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.cpp

 // file u8g_dev_st7920_128x64_HAL.cpp for the HAL version.
 
 #include "../../inc/MarlinConfig.h"
-#include <U8glib.h>
 
 #if ENABLED(U8GLIB_ST7920)
 
 #define LCD_PIXEL_WIDTH 128
 #define LCD_PIXEL_HEIGHT 64
 
+#include <U8glib.h>
+
 //set optimization so ARDUINO optimizes this file
 #pragma GCC optimize (3)