project: export qt path in Xcode project generation script

Change-Id: Id80e290ac54ba3d9055b05addd155de10f86adde
Reviewed-by: Kateryna Kostiuk <kateryna.kostiuk@savoirfairelinux.com>

genXcodeProj.sh

 #!/bin/bash
 
 cd ../install/lrc/lib/cmake/LibRingClient/
+export CMAKE_PREFIX_PATH=$(brew --prefix qt5)
 export CMAKELRCPATH=`pwd`
 cd -
 mkdir -p Ring && cd Ring