Before we only had c_utf8_to_locale, but now functionality is needed to
convert a path to UNC before converting it. That does c_utf8_path_to_locale
now, while c_utf8_string_to_locale only converts the plain string, ie.
to generate wide char strings for output.
this fixes the error and makes complete oCC compile with GCC 5.
error: ISO C does not support '__FUNCTION__' predefined identifier
[-Wpedantic]
According to the porting guide:
The fix is either to use the standard predefined identifier __func__
(since C99), or to use the __extension__ keyword.
