Surround PaintScope code with ifdefs matching declaration in include file

Change-Id: Iede85fc847b330b5586b95facafb690df7209d1b

vcl/source/opengl/OpenGLHelper.cxx

@@ -1072,6 +1072,8 @@ void OpenGLHelper::debugMsgPrint(const int nType, const char *pFormat, ...)
     va_end (aArgs);
 }
 
+#if HAVE_FEATURE_OPENGL || defined(ANDROID)
+
 OutputDevice::PaintScope::PaintScope(OutputDevice *pDev)
     : pHandle( nullptr )
 {
@@ -1108,4 +1110,6 @@ OutputDevice::PaintScope::~PaintScope()
     flush();
 }
 
+#endif
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */