quite some Xcode warnings

src/mkmaze.c

@@ -1400,7 +1400,7 @@ movebubbles()
     struct bubble *b;
     struct container *cons;
     struct trap *btrap;
-    int x, y, i, j, bcpin;
+    int x, y, i, j, bcpin = 0;
 
     /* set up the portal the first time bubbles are moved */
     if (!wportal)

src/shk.c

@@ -4828,7 +4828,7 @@ void
 globby_bill_fixup(obj_absorber, obj_absorbed)
 struct obj *obj_absorber, *obj_absorbed;
 {
-    int x, y;
+    int x = 0, y = 0;
     struct bill_x *bp, *bp_absorber = (struct bill_x *) 0;
     struct monst *shkp = 0;
     struct eshk *eshkp;