[Add] Use landing_sinister when landing on Eiroik for missions.

dat/missions/empire/collective/ec02.lua

@@ -55,6 +55,11 @@ function land()
 
   -- First mission part is landing on the planet.
   if misn_stage == 0 and planet == misn_target then
+    -- Sinister music landing.
+    music.load("landing_sinister")
+    music.play()
+
+    -- Some text.
     tk.msg(title[1], string.format(text[4], misn_target:name()))
     misn_stage = 1
     misn.setDesc(string.format(misn_desc[1], misn_base:name(), misn_base_sys:name()))

dat/missions/empire/collective/ec04.lua

@@ -75,6 +75,11 @@ function land()
 
   -- Just landing.
   if misn_stage == 0 and planet == misn_target then
+    -- Sinister music landing.
+    music.load("landing_sinister")
+    music.play()
+
+    -- Some flavour text.
     tk.msg(title[2], text[3])
     misn_stage = 1
     misn.setDesc(string.format(misn_desc[2], misn_base:name(), misn_base_sys:name()))

src/land.c

@@ -1409,7 +1409,7 @@ void land(Planet* p) {
   /* Change the music. */
   music_choose("land");
 
-  /* Run hooks. */
+  /* Run hooks, run after music in case hook wants to change music. */
   hooks_run("land");
 
   /* Generate mission computer stuff. */