Remove xcconfigs from public Cartfile.
Remove xcconfigs from public Cartfile.

* Already (correctly) exists in Cartfile.private

erichoracek/Carthage,abbeycode/Carthage,NachoSoto/Carthage,flovilmart/Carthage,flovilmart/Carthage,erichoracek/Carthage,erichoracek/Carthage,NachoSoto/Carthage,NachoSoto/Carthage,abbeycode/Carthage,flovilmart/Carthage,erichoracek/Carthage,abbeycode/Carthage,abbeycode/Carthage