Fix build warning and mypy error

- src/repository.c: include Python.h before git2 headers so _POSIX_C_SOURCE is not redefined (Python.h must come first). - pygit2/utils.py: silence mypy arg-type error in encode_fs_path; the == ffi.NULL guard cannot narrow away ffi.NULL_TYPE, same as in encode_string.

Author: Clip Art Post It

pygit2/utils.py

@@ -81,7 +81,7 @@ def encode_fs_path(
  if s is None or s == ffi.NULL:
  return ffi.NULL
 
- return os.fsencode(s)
+ return os.fsencode(s) # type: ignore[arg-type]
 
 
 @overload

src/repository.c

@@ -25,9 +25,9 @@
  * Boston, MA 02110-1301, USA.
  */
 
-#include <git2/status.h>
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
+#include <git2/status.h>
 #include "error.h"
 #include "types.h"
 #include "reference.h"