rely on meson for numpy dependency

Author: jcapriot

discretize/_extensions/meson.build

@@ -1,34 +1,6 @@
 # NumPy include directory
 numpy_nodepr_api = ['-DNPY_NO_DEPRECATED_API=NPY_1_22_API_VERSION']
-np_dep = dependency('numpy', required: false)
-if not np_dep.found()
-  # For cross-compilation it is often not possible to run the Python interpreter
-  # in order to retrieve numpy's include directory. It can be specified in the
-  # cross file instead:
-  #   [properties]
-  #   numpy-include-dir = /abspath/to/host-pythons/site-packages/numpy/core/include
-  #
-  # This uses the path as is, and avoids running the interpreter.
-  incdir_numpy = meson.get_external_property('numpy-include-dir', 'not-given')
-  if incdir_numpy == 'not-given'
-    incdir_numpy = run_command(py,
-      [
-        '-c',
-        '''import os
-import numpy as np
-try:
-  incdir = os.path.relpath(np.get_include())
-except Exception:
-  incdir = np.get_include()
-print(incdir)
-    '''
-      ],
-      check: true
-    ).stdout().strip()
-  endif
-  inc_np = include_directories(incdir_numpy)
-  np_dep = declare_dependency(include_directories: inc_np)
-endif
+np_dep = dependency('numpy')
 
 # Deal with M_PI & friends; add `use_math_defines` to c_args or cpp_args
 # Cython doesn't always get this right itself (see, e.g., gh-16800), so