ragel: use slapos gcc

current version failed to build in gcc6
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=811741

component/ragel/buildout.cfg

@@ -13,7 +13,7 @@ md5sum = 1bb39745ac23da449019f9f2cb4b0d01
 configure-options =
   --prefix=${buildout:parts-directory}/${:_buildout_section_name_}
 environment =
-  PATH=${make:location}/bin:%(PATH)s
+  PATH=${make:location}/bin:${gcc:location}/bin:%(PATH)s
 make-target =
   
   install