Adding cython v0.20.2 in third-party.

third_party/cython/src/Cython/Compiler/Scanning.pxd

Index: third_party/cython/src/Cython/Compiler/Scanning.pxd
diff --git a/third_party/cython/src/Cython/Compiler/Scanning.pxd b/third_party/cython/src/Cython/Compiler/Scanning.pxd
new file mode 100644
index 0000000000000000000000000000000000000000..b560c1ec806e58d8830b747ce2571ed7c313f4e1
--- /dev/null
+++ b/third_party/cython/src/Cython/Compiler/Scanning.pxd
@@ -0,0 +1,52 @@
+import cython
+
+from Cython.Plex.Scanners cimport Scanner
+
+cdef class Method:
+    cdef object name
+    cdef object __name__
+
+cdef class CompileTimeScope:
+    cdef public dict entries
+    cdef public CompileTimeScope outer
+    cdef declare(self, name, value)
+    cdef lookup_here(self, name)
+    cpdef lookup(self, name)
+
+cdef class PyrexScanner(Scanner):
+    cdef public context
+    cdef public list included_files
+    cdef public CompileTimeScope compile_time_env
+    cdef public bint compile_time_eval
+    cdef public bint compile_time_expr
+    cdef public bint parse_comments
+    cdef public bint in_python_file
+    cdef public source_encoding
+    cdef set keywords
+    cdef public list indentation_stack
+    cdef public indentation_char
+    cdef public int bracket_nesting_level
+    cdef public sy
+    cdef public systring
+
+    cdef long current_level(self)
+    #cpdef commentline(self, text)
+    #cpdef open_bracket_action(self, text)
+    #cpdef close_bracket_action(self, text)
+    #cpdef newline_action(self, text)
+    #cpdef begin_string_action(self, text)
+    #cpdef end_string_action(self, text)
+    #cpdef unclosed_string_action(self, text)
+    @cython.locals(current_level=cython.long, new_level=cython.long)
+    cpdef indentation_action(self, text)
+    #cpdef eof_action(self, text)
+    cdef next(self)
+    cdef peek(self)
+    #cpdef put_back(self, sy, systring)
+    #cdef unread(self, token, value)
+    cdef bint expect(self, what, message = *) except -2
+    cdef expect_keyword(self, what, message = *)
+    cdef expected(self, what, message = *)
+    cdef expect_indent(self)
+    cdef expect_dedent(self)
+    cdef expect_newline(self, message = *)