Fix packaging

MANIFEST.in

@@ -26,3 +26,6 @@ recursive-include tests/data *
 
 # Remove CFFI files
 global-exclude __pycache__/*
+
+# Add PyNaCl header files
+recursive-include src/nacl/_lib *.h

setup.py

@@ -213,8 +213,9 @@ setup(
         "nacl._lib",
         "nacl.c",
     ],
+    package_data={"nacl._lib": ["*.h"]},
 
-    ext_package="nacl",
+    ext_package="nacl._lib",
     ext_modules=ext_modules,
 
     cmdclass={

src/nacl/_lib/__init__.py

@@ -52,7 +52,7 @@ lib = ffi.verify(
     libraries=["sodium"],
 
     # Our ext_package is nacl so look for it
-    ext_package="nacl.c._lib",
+    ext_package="nacl._lib",
 )