[parser] Makefile nonsense

Includes are now explicit so they can be extracted into dependencies
for the makefile.

makedep.py

@@ -0,0 +1,16 @@
+import tomllib
+
+
+def main():
+    with open("pyproject.toml", "rb") as f:
+        result = tomllib.load(f)
+    version = result["project"]["version"]
+    includes = result["tool"]["pdm"]["build"]["includes"]
+    with open("lrparser.mk", "w", encoding="utf-8") as f:
+        f.write("# This file generated by makedep.py\n")
+        f.write(f"VERSION={version}\n")
+        f.write(f"PYTHON_SOURCES=\\\n\t{' \\\n\t'.join(includes)}\n")
+
+
+if __name__ == "__main__":
+    main()