removed dependency outside tslibs

Author: debnathshoham

pandas/_libs/tslibs/strptime.pyx

@@ -20,10 +20,10 @@ from numpy cimport (
     ndarray,
 )
 
-from pandas._libs.missing cimport checknull_with_nat_and_na
 from pandas._libs.tslibs.nattype cimport (
     NPY_NAT,
     c_nat_strings as nat_strings,
+    checknull_with_nat,
 )
 from pandas._libs.tslibs.np_datetime cimport (
     check_dts_bounds,
@@ -134,7 +134,7 @@ def array_strptime(ndarray[object] values, object fmt, bint exact=True, errors='
                 iresult[i] = NPY_NAT
                 continue
         else:
-            if checknull_with_nat_and_na(val):
+            if checknull_with_nat(val) or val.__repr__() == "<NA>":
                 iresult[i] = NPY_NAT
                 continue
             else: