ports/doom: Update and install to /usr/share/games

ports/doom/patches/0003-Add-usr-share-games-doom-as-an-iwad-directory.patch

@@ -0,0 +1,27 @@
+From 42616232560bfa8aacc85828a60dc51cfd176944 Mon Sep 17 00:00:00 2001
+From: Oskari Alaranta <oskari.alaranta@bananymous.com>
+Date: Sun, 19 Apr 2026 14:32:43 +0300
+Subject: [PATCH] Add /usr/share/games/doom as an iwad directory
+
+---
+ doomgeneric/d_iwad.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/doomgeneric/d_iwad.c b/doomgeneric/d_iwad.c
+index 508cc61..23b16da 100644
+--- a/doomgeneric/d_iwad.c
++++ b/doomgeneric/d_iwad.c
+@@ -615,6 +615,10 @@ static void BuildIWADDirList(void)
+ #else
+     AddIWADDir (FILES_DIR);
+ 
++#ifdef __banan_os__
++    AddIWADDir("/usr/share/games/doom");
++#endif
++
+     // Don't run this function again.
+ 
+     iwad_dirs_built = true;
+-- 
+2.53.0
+