Revert "Drop cursor pointer for button role"

This reverts commit 61067304cd.

The normalize.css pull request (https://github.com/necolas/normalize.css/pull/379 )
was REJECTED, *NOT* merged!

scss/_reboot.scss

@@ -196,6 +196,17 @@ img {
 }
 
 
+// iOS "clickable elements" fix for role="button"
+//
+// Fixes "clickability" issue (and more generally, the firing of events such as focus as well)
+// for traditionally non-focusable elements with role="button"
+// see https://developer.mozilla.org/en-US/docs/Web/Events/click#Safari_Mobile
+// Upstream patch for normalize.css submitted: https://github.com/necolas/normalize.css/pull/379 - remove this fix once that is merged
+
+[role="button"] {
+  cursor: pointer;
+}
+
 //
 // Tables
 //