Fix manifest to not exclude cythonized files if we are building pure python.

.gitignore

@@ -16,3 +16,4 @@ bemani.egg-info/
 server/
 emblems
 .vscode/
+MANIFEST.in

MANIFEST.assets

@@ -19,7 +19,3 @@ include bemani/frontend/static/controllers/ddr/*.js
 include bemani/frontend/static/controllers/reflec/*.js
 include bemani/frontend/static/controllers/sdvx/*.js
 include bemani/frontend/static/controllers/museca/*.js
-exclude bemani/protocol/lz77.py
-exclude bemani/protocol/stream.py
-exclude bemani/protocol/binary.py
-exclude bemani/protocol/xml.py

MANIFEST.cython

@@ -0,0 +1,8 @@
+exclude bemani/protocol/lz77.py
+exclude bemani/protocol/stream.py
+exclude bemani/protocol/binary.py
+exclude bemani/protocol/node.py
+exclude bemani/protocol/protocol.py
+exclude bemani/protocol/xml.py
+exclude bemani/format/afp/types/generic.py
+exclude bemani/format/dxt.py

setup.py

@@ -10,6 +10,9 @@ def extensions():
     # extensions. Note that the pure python code will run slower.
     if 'PURE_PYTHON' in os.environ:
         # We've been asked not to compile extensions.
+        with open("MANIFEST.in", "w") as wfp:
+            with open("MANIFEST.assets", "r") as rfp:
+                wfp.write(rfp.read())
         return []
 
     from setuptools import Extension
@@ -42,6 +45,12 @@ def extensions():
         ),
     ]
 
+    with open("MANIFEST.in", "w") as wfp:
+        with open("MANIFEST.assets", "r") as rfp:
+            wfp.write(rfp.read())
+        with open("MANIFEST.cython", "r") as rfp:
+            wfp.write(rfp.read())
+
     if 'EXPERIMENTAL_MYPYC_COMPILER' in os.environ:
         from mypyc.build import mypycify