Use os.execv instead of subprocess.run when no further action is taken.

This prevents the underlying file from being marked busy while a
long-running action is happening (e.g. eureka is open).

dcc/fabricate.py

@@ -1,8 +1,8 @@
 import contextlib
 import dcc.config
 import dcc.doom_base
+import os
 import shutil
-import subprocess
 import tempfile
 
 
@@ -18,7 +18,7 @@ class Fabricate(dcc.doom_base.WadMap):
                 command = [self.dsda]
                 if not parsed_args.fg and shutil.which("xvfb-run") is not None:
                     command = ["xvfb-run"] + command
-                subprocess.run(
+                os.execvp(command[0],
                     command + self.dsda_preamble()
                     + ["-timedemo", self.demo_in_path()]
                     + ["-viddump", self.video_path()]