STM32LTDC: Update readme.md

The original code is perfectly valid standard C. However, some compilers (especially GCC) complain about duplicate const specifiers anyway.
At this point we cave in as there doesn't seem to be any efforts to fix this problem by the corresponding compiler vendors.

uGFX v3 will no longer suffer from this problem as the driver interface works differently in this area.

drivers/gdisp/STM32LTDC/readme.md

@@ -13,9 +13,6 @@ To use this driver:
 3. Add a `board_STM32LTDC.h` to you project directory (or board directory)
 	based on one of the templates.
 
-# Limitations
-Currently, both `gOrientationPortrait` and `gOrientationLandscape` are not supported by this driver.
-
 
 # Configuration
 Configuration options available in `gfxconf.h`:
@@ -28,6 +25,7 @@ Configuration options available in `gfxconf.h`:
 | `STM32LTDC_USE_DOUBLEBUFFERING` | `GFXOFF` | Whether to use double buffering. See the corresponding section below. |
 | `STM32LTDC_USE_RGB565` | `GFXOFF` | Whether to use RGB565 instead of RGB888. |
 
+
 # 2nd layer
 To use the 2nd LTDC layer:
   - set `STM32LTDC_USE_LAYER2` to `GFXON` in `gfxconf.h`.
@@ -39,6 +37,7 @@ For more information, see:
   - https://wiki.ugfx.io/index.php/Multiple_displays#Example_-_Same_controller
   - https://wiki.ugfx.io/index.php/Multiple_displays#Access_the_displays
 
+
 # Double buffering
 To use double buffering:
   - set `STM32LTDC_USE_DOUBLEBUFFERING` to `GFXON` in `gfxconf.h`.

src/gdisp/gdisp.c

@@ -569,9 +569,9 @@ void _gdispInit(void)
 	#if defined(GDISP_DRIVER_LIST)
 		{
 			unsigned i;
-			typedef const GDISPVMT const GDISPVMTLIST[1];
+			typedef const GDISPVMT GDISPVMTLIST[1];
 
-			static const GDISPVMT * const dclist[] = {GDISP_DRIVER_LIST};
+			static const GDISPVMT* dclist[] = { GDISP_DRIVER_LIST };
 
 			for(i = 0; i < sizeof(dclist)/sizeof(dclist[0]); i++) {
 				if (!(dclist[i]->d.flags & GDISP_VFLG_DYNAMICONLY))