(PATH_LIST_SEPARATOR) [__MSDOS__ || WINDOWSNT]: Define

(PATH_LIST_SEPARATOR) [__MSDOS__ || WINDOWSNT]: Define
to semi-colon.
(FILENAME_EQ): New macro, for comparing file names.
(add_member_decl, add_global_decl, add_member_defn): Use
FILENAME_EQ.
(process_file): Don't assume that fread always reads as many bytes
as it was told to (DOS-style CR-LF text files fail this logic).
(open_file): Allocate enough space for path->path plus the file
name and the slash.