OSX-KVM - October 2021 Batch Update

Changes:

- Add Makefile to improve usability (thiagokokada)

- Typo fix (cclauss)

- Update to OpenCore-0.7.4 (via Nick)

Makefile

@@ -1,2 +1,15 @@
+DISK_SIZE := 128G
+
+all: BaseSystem.img mac_hdd_ng.img
+
+BaseSystem.img: BaseSystem.dmg
+	qemu-img convert BaseSystem.dmg -O raw BaseSystem.img
+
+BaseSystem.dmg:
+	./fetch-macOS-v2.py
+
+mac_hdd_ng.img:
+	qemu-img create -f qcow2 mac_hdd_ng.img ${DISK_SIZE}
+
 clean:
-	rm -rf content || true
+	rm -rf BaseSystem{.dmg,.img,.chunklist}