CLN: remove deprecated DEF (#47936)

* CLN: remove deprecated DEF

* fix empty line

* move consts inside of func

Author: fangchenli

pandas/_libs/hashing.pyx

@@ -21,9 +21,6 @@ import_array()
 
 from pandas._libs.util cimport is_nan
 
-DEF cROUNDS = 2
-DEF dROUNDS = 4
-
 
 @cython.boundscheck(False)
 def hash_object_array(
@@ -162,6 +159,8 @@ cdef uint64_t low_level_siphash(uint8_t* data, size_t datalen,
     cdef uint8_t* end = data + datalen - (datalen % sizeof(uint64_t))
     cdef int left = datalen & 7
     cdef int left_byte
+    cdef int cROUNDS = 2
+    cdef int dROUNDS = 4
 
     b = (<uint64_t>datalen) << 56
     v3 ^= k1