Issue #9012: Add _time.c and _time.h to the Visual Studio project file

Add these new files, added by r82034, to the pythoncore project.
diff --git a/PCbuild/pythoncore.vcproj b/PCbuild/pythoncore.vcproj
index 2388a71..6beb3c5 100644
--- a/PCbuild/pythoncore.vcproj
+++ b/PCbuild/pythoncore.vcproj
@@ -1040,6 +1040,14 @@
 				>
 			</File>
 			<File
+				RelativePath="..\Modules\_time.c"
+				>
+			</File>
+			<File
+				RelativePath="..\Modules\_time.h"
+				>
+			</File>
+			<File
 				RelativePath="..\Modules\_weakref.c"
 				>
 			</File>