pybind/cephfs: use legacy noexcept for cdefs for cython 3.Y.Z

For some newer versions of cython, it appears it requires explicitly specifying
noexcept but old versions of Cython 0.29.Z do not understand that attribute.

See: https://cython.readthedocs.io/en/latest/src/userguide/migrating_to_cy30.html#exception-values-and-noexcept

Signed-off-by: Patrick Donnelly <[email protected]>

Author: batrick

src/pybind/cephfs/c_cephfs.pxd

@@ -1,3 +1,6 @@
+# cython: language_level=3
+# cython: legacy_implicit_noexcept=True
+
 from libc.stdint cimport *
 from types cimport *
 

src/pybind/cephfs/cephfs.pyx

@@ -1,3 +1,6 @@
+# cython: language_level=3
+# cython: legacy_implicit_noexcept=True
+
 """
 This module is a thin wrapper around libcephfs.
 """