Removed LwIP option file from the core (lwipopts.h)

A default one is provided with STM32Ethernet library.
Add a file named "STM32lwipopts.h" in the sketch folder
(or in a variant) could be used instead of the default config.

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

Diff for: platform.txt

@@ -9,7 +9,7 @@ version=1.0.0
 
 # STM compile variables
 # ----------------------
-compiler.stm.extra_include="-I{build.source.path}" "-I{build.core.path}/avr" "-I{build.core.path}/stm32" "-I{build.system.path}/Drivers/{build.series}_HAL_Driver/Inc/" "-I{build.system.path}/Drivers/{build.series}_HAL_Driver/Src/" "-I{build.system.path}/{build.series}/" "-I{build.variant.path}/usb" "-I{build.variant.path}/Ethernet" "-I{build.system.path}/Middlewares/ST/STM32_USB_Device_Library/Core/Inc" "-I{build.system.path}/Middlewares/ST/STM32_USB_Device_Library/Core/Src"
+compiler.stm.extra_include="-I{build.source.path}" "-I{build.core.path}/avr" "-I{build.core.path}/stm32" "-I{build.system.path}/Drivers/{build.series}_HAL_Driver/Inc/" "-I{build.system.path}/Drivers/{build.series}_HAL_Driver/Src/" "-I{build.system.path}/{build.series}/" "-I{build.variant.path}/usb" "-I{build.system.path}/Middlewares/ST/STM32_USB_Device_Library/Core/Inc" "-I{build.system.path}/Middlewares/ST/STM32_USB_Device_Library/Core/Src"
 
 # "-I{build.system.path}/Drivers/BSP/Components" "-I{build.system.path}/Middlewares/Third_Party/FatFs/src"  "-I{build.system.path}/Middlewares/ST/STM32_USB_Device_Library/Core/Src" "-I{build.system.path}/Middlewares/ST/STM32_USB_Device_Library/Class/HID/Inc"