Qt c++ function name shadow warnings

We have a struct called mkroom and a function called mkroom()
so c++ complains about the mkroom() function hiding the
initializer for the struct.

Similarly, we have a struct called attack and a function
called attack().

There may be a more elegant way of eliminating those two
warnings, but renaming mkroom() to do_mkroom() and
attack() to do_attack() was straightforward enough.

src/mkroom.c

@@ -5,7 +5,7 @@
 
 /*
  * Entry points:
- *      mkroom() -- make and stock a room of a given type
+ *      do_mkroom() -- make and stock a room of a given type
  *      nexttodoor() -- return TRUE if adjacent to a door
  *      has_dnstairs() -- return TRUE if given room has a down staircase
  *      has_upstairs() -- return TRUE if given room has an up staircase
@@ -43,7 +43,7 @@ isbig(struct mkroom* sroom)
 
 /* make and stock a room of a given type */
 void
-mkroom(int roomtype)
+do_mkroom(int roomtype)
 {
     if (roomtype >= SHOPBASE)
         mkshop(); /* someday, we should be able to specify shop type */