Include vsapoint.cpp only before C++17.

src/libs/vlayout/vlayout.qbs

@@ -11,7 +11,8 @@ VLib {
     Depends { name: "VFormatLib" }
 
     name: "VLayoutLib"
-    files: [
+    files: {
+        var files = [
             "vlayoutexporter.h",
             "vlayoutgenerator.h",
             "vlayoutdef.h",
@@ -46,7 +47,6 @@ VLib {
             "vlayoutpoint.cpp",
             "vposition.cpp",
             "vrawlayout.cpp",
-        "vsapoint.cpp",
             "vprintlayout.cpp",
             "vtextmanager.cpp",
             "vposter.cpp",
@@ -54,8 +54,15 @@ VLib {
             "vabstractpiece.cpp",
             "vlayoutpiece.cpp",
             "vlayoutpiecepath.cpp",
-        "vrawsapoint.cpp",
-    ]
+            "vrawsapoint.cpp"
+        ];
+
+        if (Qt.core.versionMajor >= 5 && Qt.core.versionMinor < 12) {
+            files.push("vsapoint.cpp"); // need only before C++17
+        }
+
+        return files;
+    }
 
     Group {
         name: "dialogs"

src/libs/vlayout/vsapoint.cpp

@@ -26,7 +26,6 @@
  **
  *************************************************************************/
 
-
 // See https://stackoverflow.com/a/46719572/3045403
 #if __cplusplus < 201703L
 #include "vsapoint.h"