fix condition logic for coef recalculation in SpatialSubtractiveNorma…

…lization (#1283)

* replace lon glong types with size_t

Work around bug in msvc compiler in win32 mode

* fix condition logic for coef recalculation in  SpatialSubtractiveNormalization

Existing conditional expression always verified, resulting in overhead
as coeffcients were recalculated every time. Fix and simplify expression
by using chached input size.

SpatialSubtractiveNormalization.lua

@@ -63,7 +63,8 @@ end
 function SpatialSubtractiveNormalization:updateOutput(input)   
    -- compute side coefficients
    local dim = input:dim()
-   if input:dim()+1 ~= self.coef:dim() or (input:size(dim) ~= self.coef:size(dim)) or (input:size(dim-1) ~= self.coef:size(dim-1)) then
+   if not self._inpsz or not input:isSize(self._inpsz) then
+      self._inpsz = input:size()
       self.ones = self.ones or input.new()
       self._coef = self._coef or self.coef.new()
       if dim == 4 then