Include of external C code broken: add_include_file in Symtab.py unfinished

[drgrandios]

I use a statement similar to

cdef extern from "myfile.c":
      void myfunction(unsigned char arr[], unsigned char result[]) 

in my .pyx file.

This works fine in Cygwin (cython/cython3 0.25) but fails in Windows (cython 0.29) with a Type Error:

File "C:\Python37\lib\site-packages\Cython\Compiler\Nodes.py", line 499, in analyse_declarations
  env.add_include_file(self.include_file, self.verbatim_include, late)
TypeError: add_include_file() takes 2 positional arguments but 4 were given

The reason seems to be that in Compiler/Symtab.py, the signature of ModuleScope::add_include_file has been enhanced to 4 arguments:

cython/Cython/Compiler/Symtab.py

Line 1298 in 3bc22a9

def add_include_file(self, filename, verbatim_include=None, late=False):

Unfortunately, Scope::add_include_file has not been adapted properly:

cython/Cython/Compiler/Symtab.py

Line 972 in 3bc22a9

def add_include_file(self, filename):

As soon as I modify Scope::add_include_file to just forward the new arguments, everything is working again.

[drgrandios]

Very nice, thank you.