Typo in cotire_make_unity_source_file_paths function

[gunrot]

In function (cotire_make_unity_source_file_paths _language _target _maxIncludes _unityFilesVar) cotire_setup_file_extension_variables() if (NOT DEFINED unityFileExt${_language}) set (${_unityFileVar} "" PARENT_SCOPE) return()

set (${_unityFileVar} "" PARENT_SCOPE) should be 'set (${_unityFilesVar} "" PARENT_SCOPE)'