compiler: Fix missing comments
compiler: Fix missing comments

* Later versions of compilers/pre-processors are upset about the syntax
* Bracket unterminated string with proper comment tags

kylemanna/c-capnproto,opensourcerouting/c-capnproto,opensourcerouting/c-capnproto,kylemanna/c-capnproto,fluffysquirrels/c-capnproto,fluffysquirrels/c-capnproto