Fix PyArray_SearchSorted signature (GH-3606)

Cython/Includes/numpy/__init__.pxd

@@ -302,7 +302,6 @@ cdef extern from "numpy/arrayobject.h":
             """
             return PyArray_BYTES(self)
 
-
     ctypedef unsigned char      npy_bool
 
     ctypedef signed char      npy_byte
@@ -655,7 +654,7 @@ cdef extern from "numpy/arrayobject.h":
     object PyArray_Choose (ndarray, object, ndarray, NPY_CLIPMODE)
     int PyArray_Sort (ndarray, int, NPY_SORTKIND)
     object PyArray_ArgSort (ndarray, int, NPY_SORTKIND)
-    object PyArray_SearchSorted (ndarray, object, NPY_SEARCHSIDE)
+    object PyArray_SearchSorted (ndarray, object, NPY_SEARCHSIDE, PyObject*)
     object PyArray_ArgMax (ndarray, int, ndarray)
     object PyArray_ArgMin (ndarray, int, ndarray)
     object PyArray_Reshape (ndarray, object)

tests/run/numpy_test.pyx

@@ -944,3 +944,17 @@ def test_broadcast_comparison(np.ndarray[double, ndim=1] a):
     cdef object obj = a
     return a == 0, obj == 0, a == 1, obj == 1
 
+
+@testcase
+def test_c_api_searchsorted(np.ndarray arr, other):
+    """
+    >>> arr = np.random.randn(10)
+    >>> other = np.random.randn(5)
+    >>> result, expected = test_c_api_searchsorted(arr, other)
+    >>> (result == expected).all()
+    True
+    """
+    result = np.PyArray_SearchSorted(arr, other, np.NPY_SEARCHRIGHT, NULL)
+
+    expected = arr.searchsorted(other, side="right")
+    return result, expected