FIX gcs compile problem on gentoo

I was getting compile errors of the form 
    
    TauLabs/ground/gcs/src/libs/glc_lib/3rdparty/quazip/ioapi.h:38:44: error: expected initializer before 'OF'

when compiling the gcs with the new uploader on Gentoo Linux. I'm not sure what exactly the problem is but this fixes it. The solution is the same as the one found [here](https://bugs.gentoo.org/show_bug.cgi?id=383569).