Adding cython v0.20.2 in third-party.

third_party/cython/src/Cython/Includes/libc/stdio.pxd

+# 7.19 Input/output <stdio.h>
+
+
+# deprecated cimports for backwards compatibility:
+from libc.string cimport const_char, const_void
+
+
+cdef extern from "stdio.h" nogil:
+
+    ctypedef struct FILE
+    cdef FILE *stdin
+    cdef FILE *stdout
+    cdef FILE *stderr
+
+    enum: FOPEN_MAX
+    enum: FILENAME_MAX
+    FILE *fopen   (const char *filename, const char  *opentype)
+    FILE *freopen (const char *filename, const char *opentype, FILE *stream)
+    FILE *fdopen  (int fdescriptor, const char *opentype)
+    int  fclose   (FILE *stream)
+    int  remove   (const char *filename)
+    int  rename   (const char *oldname, const char *newname)
+    FILE *tmpfile ()
+
+    int remove (const char *pathname)
+    int rename (const char *oldpath, const char *newpath)
+
+    enum: _IOFBF
+    enum: _IOLBF
+    enum: _IONBF
+    int setvbuf (FILE *stream, char *buf, int mode, size_t size)
+    enum: BUFSIZ
+    void setbuf (FILE *stream, char *buf)
+
+    size_t fread  (void *data, size_t size, size_t count, FILE *stream)
+    size_t fwrite (const void *data, size_t size, size_t count, FILE *stream)
+    int    fflush (FILE *stream)
+
+    enum: EOF
+    void clearerr (FILE *stream)
+    int feof      (FILE *stream)
+    int ferror    (FILE *stream)
+
+    enum: SEEK_SET
+    enum: SEEK_CUR
+    enum: SEEK_END
+    int      fseek  (FILE *stream, long int offset, int whence)
+    void     rewind (FILE *stream)
+    long int ftell  (FILE *stream)
+
+    ctypedef struct fpos_t
+    ctypedef const fpos_t const_fpos_t "const fpos_t"
+    int fgetpos (FILE *stream, fpos_t *position)
+    int fsetpos (FILE *stream, const fpos_t *position)
+
+    int scanf    (const char *template, ...)
+    int sscanf   (const char *s, const char *template, ...)
+    int fscanf   (FILE *stream, const char *template, ...)
+
+    int printf   (const char *template, ...)
+    int sprintf  (char *s, const char *template, ...)
+    int snprintf (char *s, size_t size, const char *template, ...)
+    int fprintf  (FILE *stream, const char *template, ...)
+
+    void perror  (const char *message)
+
+    char *gets  (char *s)
+    char *fgets (char *s, int count, FILE *stream)
+    int getchar ()
+    int fgetc   (FILE *stream)
+    int getc    (FILE *stream)
+    int ungetc  (int c, FILE *stream)
+
+    int puts    (const char *s)
+    int fputs   (const char *s, FILE *stream)
+    int putchar (int c)
+    int fputc   (int c, FILE *stream)
+    int putc    (int c, FILE *stream)
+
+    size_t getline(char **lineptr, size_t *n, FILE *stream)