Remove output of QT_PRODUCT_LICENSEKEY

This is not being used anywhere anymore.

Change-Id: I4d8ded9e9f6c28b594930bd1ea9347ba2db8a2e8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

configure

@@ -5863,7 +5863,6 @@ cat <<EOF
 EOF
 
 echo '/* Compile time features */'
-[ '!' -z "$LicenseKeyExt" ] && echo "#define QT_PRODUCT_LICENSEKEY \"$LicenseKeyExt\""
 
 if [ "$CFG_SHARED" = "no" ]; then
     cat <<EOF