py-protobuf3: add py314 subport

Author: markmentovai

python/py-protobuf3/Portfile

@@ -51,7 +51,7 @@ compiler.cxx_standard  \
 # error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
 compiler.blacklist {clang < 900}
 
-python.versions 27 39 310 311 312 313
+python.versions 27 39 310 311 312 313 314
 
 if {${name} ne ${subport}} {
     conflicts       py${python.version}-protobuf
@@ -124,9 +124,11 @@ if {${name} ne ${subport}} {
 
     if {${python.version} > 27} {
         test.run        yes
-        python.test_framework
-        test.cmd        "${python.bin} setup.py"
-        test.target     test --cpp_implementation
+        if {!${python.pep517}} {
+            python.test_framework
+            test.cmd    "${python.bin} setup.py"
+            test.target test --cpp_implementation
+        }
     }
 }