drop geom.c prior to merge

src/lib/geom.c

@@ -1,13 +0,0 @@
-#include "internal.h"
-
-// find the center coordinate of a plane, preferring the top/left in the
-// case of an even number of rows/columns (in such a case, there will be one
-// more cell to the bottom/right of the center than the top/left).
-void ncplane_center(const ncplane* n, int* y, int* x){
-  if(y){
-    *y = ((n->leny - 1) / 2);
-  }
-  if(x){
-    *x = ((n->lenx - 1) / 2);
-  }
-}