Subject: Add support for system iwad dirs
Author: Hans de Goede <hdegoede@redhat.com>

Make vavoom check /usr/share/games/doom and /usr/share/doom for wads
when no iwaddir is specified on the commandline.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff -up vavoom-1.33/source/files.cpp~ vavoom-1.33/source/files.cpp
--- vavoom-1.33/source/files.cpp~	2016-01-04 21:09:15.000000000 +0100
+++ vavoom-1.33/source/files.cpp	2016-01-04 21:16:04.440620918 +0100
@@ -487,6 +487,12 @@ void FL_Init()
 		}
 	}
 
+	// If no dirs were specified look in the system default dir
+	if (IWadDirs.Num() == 0) {
+		IWadDirs.Append("/usr/share/games/doom");
+		IWadDirs.Append("/usr/share/doom");
+	}
+
 	AddGameDir("basev/common");
 
 	p = GArgs.CheckValue("-iwad");