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Add a -version parameter like most programs have

Supports both -version and --version, even though the later breaks
the normal convention of Doom parameters, it is common enough with
any general program that it should be useful to include in this.

--- a/src/i_main.c

+++ b/src/i_main.c

@@ -41,6 +41,17 @@

     myargc = argc;

     myargv = argv;

+    //!

+    // @arg

+    //

+    // Print the program version and exit.

+    //

+

+    if (M_ParmExists("-version") || M_ParmExists("--version")) {

+        puts (PACKAGE_NAME " " PACKAGE_VERSION);

+        exit (0);

+    }

+

     M_FindResponseFile();

     #ifdef SDL_HINT_NO_SIGNAL_HANDLERS