Handle Numpy deprecated API without touching CMake

Instead cdef from `numpy/npy_no_deprecated_api.h`

Author: ndgrigorian

dpctl/CMakeLists.txt

@@ -125,8 +125,6 @@ function(build_dpctl_ext _trgt _src _dest)
             )
         endif()
     endif()
-    # needed to prevent warnings from Cython caused by cimporting from Numpy
-    target_compile_definitions(${_trgt} PRIVATE NPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION)
     target_link_libraries(${_trgt} PRIVATE Python::NumPy)
     if (DPCTL_GENERATE_COVERAGE)
         target_compile_definitions(${_trgt} PRIVATE CYTHON_TRACE=1 CYTHON_TRACE_NOGIL=1)

dpctl/tensor/_dlpack.pxd

@@ -18,6 +18,8 @@
 # cython: language_level=3
 # cython: linetrace=True
 
+cdef extern from "numpy/npy_no_deprecated_api.h":
+    pass
 from numpy cimport ndarray
 
 from .._sycl_device cimport SyclDevice

dpctl/tensor/_dlpack.pyx

@@ -18,6 +18,9 @@
 # cython: language_level=3
 # cython: linetrace=True
 
+cdef extern from "numpy/npy_no_deprecated_api.h":
+    pass
+
 cimport cpython
 from libc cimport stdlib
 from libc.stdint cimport int32_t, int64_t, uint8_t, uint16_t, uint32_t, uint64_t