Drop test failing on HHVM

Can readd if Travis ever updates the HHVM version again, I
remember this being fixed ages ago.

Author: nikic

test/code/prettyPrinter/stmt/if.test

@@ -8,20 +8,9 @@ if ($expr) {
 
 } else {
 
-}
-
-if ($expr) {
-} else if ($expr2) {
-} else {
 }
 -----
 if ($expr) {
 } elseif ($expr2) {
 } else {
-}
-if ($expr) {
-} else {
-    if ($expr2) {
-    } else {
-    }
 }