Do not include C files in wheel

Author: rhpvorderman

MANIFEST.in

@@ -1 +1,2 @@
-graft src/isal/isa-l
+graft src/isal/isa-l
+include src/isal/*.h

setup.py

@@ -175,7 +175,7 @@ def build_isa_l(compiler_command: str, compiler_options: str):
     zip_safe=False,
     packages=find_packages('src'),
     package_dir={'': 'src'},
-    package_data={'isal': ['*.pyi', 'py.typed', '*.c', '*.h',
+    package_data={'isal': ['*.pyi', 'py.typed',
                            # Include isa-l LICENSE and other relevant files
                            # with the binary distribution.
                            'isa-l/LICENSE', 'isa-l/README.md',