setup_board: remove extra pkg-config wrapper script
setup_board: remove extra pkg-config wrapper script

crossdev provides cross-pkg-config which respects $SYSROOT so we do not
need to do anything extra ourselves.

BugRoger/scripts,coreos/scripts,sigma/coreos-scripts,marineam/coreos-scripts,vmware/coreos-scripts,endocode/scripts,gtank/scripts,andrejro/coreos--scripts,gtank/scripts,zhang0137/scripts,trnubo/scripts,mischief/scripts,zhang0137/scripts,fivethreeo/scripts,marineam/coreos-scripts,smilart/scripts,sigma/coreos-scripts,BugRoger/scripts,fivethreeo/scripts,mjg59/scripts,trnubo/scripts,nicescale/scripts,vmware/coreos-scripts,sigma/coreos-scripts,mjg59/scripts,smilart/scripts,mjg59/scripts,glevand/coreos--scripts,andrejro/coreos--scripts,coreos/scripts,glevand/coreos--scripts,gtank/scripts,zhang0137/scripts,mischief/scripts,nicescale/scripts,nicescale/scripts,BugRoger/scripts,marineam/coreos-scripts,endocode/scripts,smilart/scripts,vmware/coreos-scripts,trnubo/scripts,endocode/scripts,mischief/scripts,fivethreeo/scripts,andrejro/coreos--scripts