Move definition of sa_feature to .cpp to avoid unsed variable warning.

Signed-off-by: Tom Prince <tom.prince@ualberta.net>

library/include/dfhack/modules/Maps.h

@@ -23,13 +23,7 @@ namespace DFHack
         feature_Hell_Temple
     };
 
-    static const char * sa_feature[]=
-    {
-        (char*)"Other",
-        (char*)"Adamantine Tube",
-        (char*)"Underworld",
-        (char*)"Hell Temple"
-    };
+    extern const char * sa_feature[];
 
     /// used as a key for the local feature map. combines X an Y coords.
     union planecoord

library/modules/Maps.cpp

@@ -40,6 +40,14 @@ distribution.
 #define MAPS_GUARD if(!d->Started) throw DFHack::Error::ModuleNotInitialized();
 using namespace DFHack;
 
+const char * sa_feature[]=
+{
+    "Other",
+    "Adamantine Tube",
+    "Underworld",
+    "Hell Temple"
+};
+
 struct Maps::Private
 {
     uint32_t * block;
@@ -948,4 +956,4 @@ bool Maps::ReadVegetation(uint32_t x, uint32_t y, uint32_t z, std::vector<t_tree
     }
     if(plants->empty()) return false;
     return true;
-}
+}