Define unix platform interfaces also without opengl

Fix build without opengl.

Change-Id: I691fd4112d69b16690915fcf33f5ae30ca2d7a93
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

src/gui/platform/unix/qunixplatforminterface.cpp

@@ -83,6 +83,8 @@ QOpenGLContext *QPlatformInterface::QEGLContext::fromNative(EGLContext context,
 }
 #endif
 
+#endif // QT_NO_OPENGL
+
 #if QT_CONFIG(xcb)
 QT_DEFINE_PRIVATE_PLATFORM_INTERFACE(QXcbScreen);
 QT_DEFINE_PRIVATE_PLATFORM_INTERFACE(QXcbWindow);
@@ -102,6 +104,4 @@ QEvdevKeyMapper *QKeyMapper::platformInterface<QEvdevKeyMapper>() const
 }
 #endif
 
-#endif // QT_NO_OPENGL
-
 QT_END_NAMESPACE