Adding cython v0.20.2 in third-party.

third_party/cython/src/Cython/Plex/Scanners.pxd

Index: third_party/cython/src/Cython/Plex/Scanners.pxd
diff --git a/third_party/cython/src/Cython/Plex/Scanners.pxd b/third_party/cython/src/Cython/Plex/Scanners.pxd
new file mode 100644
index 0000000000000000000000000000000000000000..1415220f0a2a6f5fcca367935bd1a6288dc1a573
--- /dev/null
+++ b/third_party/cython/src/Cython/Plex/Scanners.pxd
@@ -0,0 +1,43 @@
+import cython
+
+from Cython.Plex.Actions cimport Action
+
+cdef class Scanner:
+
+    cdef public lexicon
+    cdef public stream
+    cdef public name
+    cdef public unicode buffer
+    cdef public Py_ssize_t buf_start_pos
+    cdef public Py_ssize_t next_pos
+    cdef public Py_ssize_t cur_pos
+    cdef public Py_ssize_t cur_line
+    cdef public Py_ssize_t cur_line_start
+    cdef public Py_ssize_t start_pos
+    cdef public Py_ssize_t start_line
+    cdef public Py_ssize_t start_col
+    cdef public text
+    cdef public initial_state # int?
+    cdef public state_name
+    cdef public list queue
+    cdef public bint trace
+    cdef public cur_char
+    cdef public int input_state
+
+    cdef public level
+
+    @cython.locals(input_state=long)
+    cdef next_char(self)
+    @cython.locals(action=Action)
+    cdef tuple read(self)
+    cdef tuple scan_a_token(self)
+    cdef tuple position(self)
+
+    @cython.locals(cur_pos=long, cur_line=long, cur_line_start=long,
+                   input_state=long, next_pos=long, state=dict,
+                   buf_start_pos=long, buf_len=long, buf_index=long,
+                   trace=bint, discard=long, data=unicode, buffer=unicode)
+    cdef run_machine_inlined(self)
+
+    cdef begin(self, state)
+    cdef produce(self, value, text = *)