Made RTS AI target drills too

core/src/mindustry/ai/RtsAI.java

@@ -31,7 +31,7 @@ public class RtsAI{
     static final int timeUpdate = 0, timerSpawn = 1, maxTargetsChecked = 15;
 
     //in order of priority??
-    static final BlockFlag[] flags = {BlockFlag.generator, BlockFlag.factory, BlockFlag.core, BlockFlag.battery};
+    static final BlockFlag[] flags = {BlockFlag.generator, BlockFlag.factory, BlockFlag.core, BlockFlag.battery, BlockFlag.drill};
     static final ObjectFloatMap<Building> weights = new ObjectFloatMap<>();
     static final boolean debug = OS.hasProp("mindustry.debug");
 

core/src/mindustry/world/blocks/production/BeamDrill.java

@@ -5,6 +5,7 @@ import arc.graphics.*;
 import arc.graphics.g2d.*;
 import arc.math.*;
 import arc.math.geom.*;
+import arc.struct.*;
 import arc.util.*;
 import arc.util.io.*;
 import mindustry.annotations.Annotations.*;
@@ -64,6 +65,7 @@ public class BeamDrill extends Block{
         ambientSound = Sounds.minebeam;
 
         envEnabled |= Env.space;
+        flags = EnumSet.of(BlockFlag.drill);
     }
 
     @Override

core/src/mindustry/world/blocks/production/Drill.java

@@ -79,6 +79,7 @@ public class Drill extends Block{
         ambientSoundVolume = 0.018f;
         //drills work in space I guess
         envEnabled |= Env.space;
+        flags = EnumSet.of(BlockFlag.drill);
     }
 
     @Override

core/src/mindustry/world/blocks/production/WallCrafter.java

@@ -5,6 +5,7 @@ import arc.func.*;
 import arc.graphics.g2d.*;
 import arc.math.*;
 import arc.math.geom.*;
+import arc.struct.*;
 import arc.util.*;
 import mindustry.annotations.Annotations.*;
 import mindustry.content.*;
@@ -48,6 +49,7 @@ public class WallCrafter extends Block{
         regionRotated1 = 1;
 
         envEnabled |= Env.space;
+        flags = EnumSet.of(BlockFlag.drill);
     }
 
     @Override

core/src/mindustry/world/meta/BlockFlag.java

@@ -20,6 +20,8 @@ public enum BlockFlag{
     reactor,
     /** Blocks that extinguishes fires. */
     extinguisher,
+    /** Is a drill. */
+    drill,
 
     //special, internal identifiers
     launchPad,