Use #pragma message and not #pragma warning for MSVC.

This fixes MSVC compilation with wxUSE_APPLE_IEEE==0.

Closes #11141.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61764 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/datstrm.cpp

@@ -551,7 +551,11 @@ void wxDataOutputStream::WriteDouble(double d)
 #else
   wxUnusedVar(d);
 #if !defined(__VMS__) && !defined(__GNUG__)
+#ifdef _MSC_VER
+# pragma message("wxDataOutputStream::WriteDouble() not using IeeeExtended - will not work!")
+#else
 # pragma warning "wxDataOutputStream::WriteDouble() not using IeeeExtended - will not work!"
+#endif
 #endif
    buf[0] = '\0';
 #endif