Update _pvt_struct based on Python 3.8

LICENSE

@@ -1,4 +1,6 @@
+-------------------------------------------------------------------------------
 PyCUDA is licensed to you under the MIT/X Consortium license:
+-------------------------------------------------------------------------------
 
 Copyright (c) 2009,10 Andreas Klöckner and Contributors.
 
@@ -23,9 +25,11 @@ WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 OTHER DEALINGS IN THE SOFTWARE.
 
+-------------------------------------------------------------------------------
 PyCUDA includes derivatives of parts of the `Thrust
 <https://github.com/thrust/thrust/>`_ computing package (in particular the scan
 implementation). These parts are licensed as follows:
+-------------------------------------------------------------------------------
 
     Copyright 2008-2011 NVIDIA Corporation
 
@@ -41,3 +45,53 @@ implementation). These parts are licensed as follows:
     See the License for the specific language governing permissions and
     limitations under the License.
 
+-------------------------------------------------------------------------------
+PyCUDA includes a modified version of the _struct module from CPython:
+-------------------------------------------------------------------------------
+
+1. This LICENSE AGREEMENT is between the Python Software Foundation
+("PSF"), and the Individual or Organization ("Licensee") accessing and
+otherwise using this software ("Python") in source or binary form and
+its associated documentation.
+
+2. Subject to the terms and conditions of this License Agreement, PSF hereby
+grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce,
+analyze, test, perform and/or display publicly, prepare derivative works,
+distribute, and otherwise use Python alone or in any derivative version,
+provided, however, that PSF's License Agreement and PSF's notice of copyright,
+i.e., "Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 Python Software Foundation;
+All Rights Reserved" are retained in Python alone or in any derivative version
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+
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+or incorporates Python or any part thereof, and wants to make
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+

setup.py

@@ -186,11 +186,6 @@ def main():
 
     import sys
 
-    if sys.version_info >= (3,):
-        pvt_struct_source = "src/wrapper/_pvt_struct_v3.cpp"
-    else:
-        pvt_struct_source = "src/wrapper/_pvt_struct_v2.cpp"
-
     setup(
         name="pycuda",
         # metadata
@@ -254,7 +249,7 @@ def main():
             ),
             ExtensionUsingNumpy(
                 "_pvt_struct",
-                [pvt_struct_source],
+                ["src/wrapper/_pvt_struct_v3.cpp"],
                 extra_compile_args=conf["CXXFLAGS"],
                 extra_link_args=conf["LDFLAGS"],
             ),