Fixes some ModelArrange warnings

src/libslic3r/MTUtils.hpp

@@ -242,15 +242,6 @@ template<class C> bool all_of(const C &container)
                        });
 }
 
-template<class X, class Y> inline X ceil_i(X x, Y y)
-{
-    static_assert(std::is_integral<X>::value &&
-                      std::is_integral<Y>::value && sizeof(X) >= sizeof(Y),
-                  "");
-
-    return (x % y) ? x / y + 1 : x / y;
-}
-
 // A shorter C++14 style form of the enable_if metafunction
 template<bool B, class T>
 using enable_if_t = typename std::enable_if<B, T>::type;