zip: Make sure Layout::tendency is inlinable

This method showed up in profiling because it wasn't inlinable.

Author: bluss

src/layout/mod.rs

@@ -58,6 +58,7 @@ impl Layout {
 
     /// A simple "score" method which scores positive for preferring C-order, negative for F-order
     /// Subject to change when we can describe other layouts
+    #[inline]
     pub(crate) fn tendency(self) -> i32 {
         (self.is(CORDER) as i32 - self.is(FORDER) as i32) +
         (self.is(CPREFER) as i32 - self.is(FPREFER) as i32)