Added back postbuild.cmd for github action

sfall/postbuild.cmd

@@ -0,0 +1,21 @@
+@ECHO OFF
+
+rem debug, release, etc.
+SET type=%1
+rem full path to the compiled DLL
+SET target=%2
+
+::SET destination=d:\GAMES\Fallout2\@RP\ddraw.dll
+
+SET pdb="%~dpn2.pdb"
+
+IF EXIST ducible.exe (
+    IF EXIST %pdb% (
+        ducible %target% %pdb%
+    ) ELSE (
+        ducible %target%
+    )
+)
+
+::echo Copying %target% to %destination% ...
+::copy %target% %destination%