Fix warnings about implicit float or double to int conversions in wxMSW.

Make the conversions explicit as these warnings are harmless.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74491 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/spinctlg.cpp

@@ -284,7 +284,7 @@ wxSize wxSpinCtrlGenericBase::DoGetSizeFromTextSize(int xlen, int ylen) const
 
     wxSize tsize(xlen + sizeBtn.x + MARGIN, totalS.y);
 #if defined(__WXMSW__)
-    tsize.IncBy(0.4 * totalS.y + 4, 0);
+    tsize.IncBy(4*totalS.y/10 + 4, 0);
 #elif defined(__WXGTK__)
     tsize.IncBy(totalS.y + 10, 0);
 #endif // MSW GTK