Some preprocessor symbols for campaigns to enable/disable some advancements

This should not make any change when they are not defined (ie in multiplayer)

- DISABLE_GRAND_MARSHAL (used by TRoW): Disable General -> Grand Marshal

- ENABLE_ARMAGEDDON_DRAKE (used by none): Enable Inferno Drake ->
  Armageddon Drake

- ENABLE_ANCIENT_LICH (used by none): Enable Lich -> Ancient Lich

- ENABLE_DEATH_KNIGHT (used by none): Enable Revenant -> Death_Knight
  (not sure we should have this one)

data/campaigns/The_Rise_Of_Wesnoth/_main.cfg

@@ -7,7 +7,7 @@
     #textdomain wesnoth-trow
     name= _ "The Rise of Wesnoth"
     define=CAMPAIGN_THE_RISE_OF_WESNOTH
-    extra_defines=USE_L3_OUTLAWS
+    extra_defines=USE_L3_OUTLAWS,DISABLE_GRAND_MARSHAL
     first_scenario=A_Summer_of_Storms
     difficulties=EASY,NORMAL,HARD
     difficulty_descriptions={MENU_IMG_TXT2 TRoW_difficulty_easy.png _"Fighter" _"(Easy)"} +

data/core/units/drakes/Armageddon.cfg

@@ -13,6 +13,12 @@
     level=4
     alignment=lawful
     advanceto=null
+#ifdef ENABLE_ARMAGEDDON_DRAKE
+    [advancefrom]
+        unit=Inferno Drake
+        experience=220
+    [/advancefrom]
+#endif
     {AMLA_TOUGH 3}
     undead_variation=drake
     cost=100

data/core/units/humans/Loyalist_General.cfg

@@ -18,7 +18,7 @@
     experience=180
     level=3
     alignment=lawful
-#ifdef CAMPAIGN_THE_RISE_OF_WESNOTH
+#ifdef DISABLE_GRAND_MARSHAL
     advanceto=null
     {AMLA_TOUGH 3}
 #else

data/core/units/undead/Necro_Ancient_Lich.cfg

@@ -12,6 +12,12 @@
     level=4
     alignment=chaotic
     advanceto=null
+#ifdef ENABLE_ANCIENT_LICH
+    [advancefrom]
+        unit=Lich
+        experience=250
+    [/advancefrom]
+#endif
     {AMLA_TOUGH 3}
     cost=100
     usage=mixed fighter

data/core/units/undead/Skele_Death_Knight.cfg

@@ -19,6 +19,12 @@
     level=3
     alignment=chaotic
     advanceto=null
+#ifdef ENABLE_DEATH_KNIGHT
+    [advancefrom]
+        unit=Revenant
+        experience=85
+    [/advancefrom]
+#endif
     {AMLA_TOUGH 3}
     cost=45
     usage=fighter