run.sh: Fix building Pillow on MINGW

run.sh

@@ -83,6 +83,9 @@ clean_venv_run() {
 	python -m venv .venv
 	source .venv/bin/activate
 #	python -m pip install -U pip
+	# Necessary for Windows if compiling things like Pillow
+	export CFLAGS="-I/mingw64/include"
+#	export LDFLAGS="-L/mingw64/lib"
 	pip install -r requirements.txt -r requirements_devel.txt build
 	python -m compile_translations
 	python -m build --wheel