Removed the IF_TERRAIN macro,

...since it hasn't been needed for anything in a long while.

data/core/macros/utils.cfg

@@ -163,41 +163,6 @@
     {CLEAR_VARIABLE STORE_UNIT_VAR_store}
 #enddef
 
-#define IF_TERRAIN X Y TYPES CONTENTS
-    # This is a way to check whether or not the terrain in the given coordinates
-    # is of the given type or types. Might be useful, since filtering by terrain
-    # isn't possible directly.
-    #
-    # You can use it, for example, like this:
-    #! [event]
-    #!     name=moveto
-    #!     first_time_only=no
-    #!
-    #!     {IF_TERRAIN $x1 $y1 gfm (
-    #!         [then]
-    #!             {DEBUG_MSG "Stepped on grassland, forest or mountains!"}
-    #!         [/then]
-    #!     )}
-    #! [/event]
-    [store_locations]
-        x={X}
-        y={Y}
-        terrain={TYPES}
-        variable=IF_TERRAIN_temp
-    [/store_locations]
-
-    [if]
-        [variable]
-            name=IF_TERRAIN_temp.length
-            not_equals=0
-        [/variable]
-
-        {CONTENTS}
-    [/if]
-
-    {CLEAR_VARIABLE IF_TERRAIN_temp}
-#enddef
-
 #define GENERIC_UNIT SIDE TYPE X Y
     # Creates a generic unit of TYPE belonging to SIDE at X,Y, which has a
     # random name and traits (just like a recruited unit).