Submodule patches now called from Makefile (e.g. make patch)

Makefile

@@ -38,3 +38,7 @@ clean:
 clean_win:
 	-"rd /S /Q bin"
 	-"rd /S /Q build"
+
+patch:
+	git -C ext/lwip apply ../lwip.patch
+	git -C ext/lwip-contrib apply ../lwip-contrib.patch

README.md

@@ -65,7 +65,7 @@ We recommend using [CMake](https://cmake.org/) for its extensive cross-platform
 ```
 git submodule init
 git submodule update
-./ext/patch_submodules.sh
+make patch
 cmake -H. -Bbuild -DCMAKE_BUILD_TYPE=DEBUG
 cmake --build build 
 ```

ext/patch_submodules.sh

@@ -1,14 +0,0 @@
-#!/bin/bash
-
-# Execute from project root directory
-
-cd ext/lwip
-cp ../lwip.patch .
-git apply lwip.patch
-cd ../..
-
-cd ext/lwip-contrib
-cp ../lwip-contrib.patch .
-git apply lwip-contrib.patch
-
-cd ../..