Port build_ssl.py to 2.4; support HOST_PYTHON variable
diff --git a/PCbuild/x64.vsprops b/PCbuild/x64.vsprops
index c7eabbe..0720084 100644
--- a/PCbuild/x64.vsprops
+++ b/PCbuild/x64.vsprops
@@ -15,4 +15,8 @@
 		Name="VCLinkerTool"
 		TargetMachine="17"
 	/>
+	<UserMacro
+		Name="PythonExe"
+		Value="$(HOST_PYTHON)"
+	/>
 </VisualStudioPropertySheet>