libqdutils: Allow screen refresh to be called via dynamic link

Exposing refreshScreen to accomodate calling of screenRefresh
by native daemons that use dynamic loading of the libqdutils
shared library.

Change-Id: Id2bf67e43361fdb739e997f47d014d5ebd13e1d7
diff --git a/libqdutils/display_config.cpp b/libqdutils/display_config.cpp
index 7ff106f..dc9f539 100644
--- a/libqdutils/display_config.cpp
+++ b/libqdutils/display_config.cpp
@@ -135,3 +135,12 @@
 }
 
 }; //namespace
+
+// ----------------------------------------------------------------------------
+// Screen refresh for native daemons linking dynamically to libqdutils
+// ----------------------------------------------------------------------------
+extern "C" int refreshScreen() {
+    int ret = 0;
+    ret = screenRefresh();
+    return ret;
+}