e5e99dcdc2
libFLAC DLLs were exposing windows_unicode_filename.h functions
because flac and metaflac needed to set flac_internal_set_utf8_
filenames. Files windows_unicode_filename.{c/h} and
win_utf8_io.[c/h] are merged, and all non-utf8 parts are removed.
With this commit, the libFLAC DLL interface is the same as the
libFLAC interface of shared libraries on other platforms