xbps-bin::install.c: remove unused var to make this build with gcc-4.6.
xbps-bin::install.c: remove unused var to make this build with gcc-4.6.

Reported and patch provided by ojab in issue 4.

ebfe/xbps,datenwolf/xbps,stpx/xbps,ebfe/xbps,stpx/xbps,datenwolf/xbps,datenwolf/xbps,ebfe/xbps,stpx/xbps