Remove no longer used build/platform/xcode/ya.make.inc

commit_hash:63e6ebee30bb789b44fbf383854e6b6f84a3df60

build/ymake.core.conf

@@ -5622,8 +5622,6 @@ macro COLLECT_YAML_CONFIG_FILES(Varname, Dir) {
     _GLOB($Varname $Dir/**/*.yaml EXCLUDE **/a.yaml)
 }
 
-# tag:swift-specific
-CPP_XCODE_TOOLCHAIN_VERSION=9.2
 XCODE_TOOLS_VERSION=10.1
 
 TEST_TOOL_HOST_LOCAL=