Fix compilation error in Hooks.cpp when OXT_DISABLE_BACKTRACES is defined.
Fix compilation error in Hooks.cpp when OXT_DISABLE_BACKTRACES is defined.

fabiokung/passenger-debian,erikogan/passenger,antek-drzewiecki/passenger,jawj/passenger,cgvarela/passenger,fabiokung/passenger-debian,openSUSE/passenger,antek-drzewiecki/passenger,antek-drzewiecki/passenger,jawj/passenger,kewaunited/passenger,phusion/passenger,fabiokung/passenger-debian,bf4/passenger,clemensg/passenger,gravitystorm/passenger,kewaunited/passenger,phusion/passenger,jawj/passenger,kewaunited/passenger,pkmiec/passenger,phusion/passenger,antek-drzewiecki/passenger,phusion/passenger,bf4/passenger,bf4/passenger,bf4/passenger,erikogan/passenger,openSUSE/passenger,gravitystorm/passenger,openSUSE/passenger,clemensg/passenger,antek-drzewiecki/passenger,clemensg/passenger,gravitystorm/passenger,gravitystorm/passenger,phusion/passenger,pkmiec/passenger,cgvarela/passenger,openSUSE/passenger,erikogan/passenger,cgvarela/passenger,erikogan/passenger,gravitystorm/passenger,phusion/passenger,clemensg/passenger,pkmiec/passenger,cgvarela/passenger,cgvarela/passenger,openSUSE/passenger,kewaunited/passenger,cgvarela/passenger,cgvarela/passenger,pkmiec/passenger,antek-drzewiecki/passenger,jawj/passenger,kewaunited/passenger,pkmiec/passenger,jawj/passenger,jawj/passenger,kewaunited/passenger,openSUSE/passenger,phusion/passenger,phusion/passenger,clemensg/passenger,antek-drzewiecki/passenger,kewaunited/passenger,pkmiec/passenger,clemensg/passenger,cgvarela/passenger,bf4/passenger,bf4/passenger,erikogan/passenger,pkmiec/passenger,clemensg/passenger,fabiokung/passenger-debian,erikogan/passenger,jawj/passenger,fabiokung/passenger-debian,bf4/passenger,clemensg/passenger,kewaunited/passenger,antek-drzewiecki/passenger,gravitystorm/passenger,fabiokung/passenger-debian