Remove TODOs related to Crystal 0.22 (#5546)

Sija · RX14 · commit 4c2f6f64b7ef · 2018-01-20T22:37:48.000Z
diff --git a/src/crystal/system.cr b/src/crystal/system.cr
@@ -12,7 +12,6 @@ require "./system/unix/hostname"
 
 {% if flag?(:freebsd) || flag?(:openbsd) %}
   require "./system/unix/sysctl_cpucount"
-{% else %}
-  # TODO: restrict on flag?(:unix) after crystal > 0.22.0 is released
+{% elsif flag?(:unix) %}
   require "./system/unix/sysconf_cpucount"
 {% end %}
