tdf#93620: show OpenGL status in Help->About

Build ID will show enabled OpenGL with an extra string "-GL"
helping the fix of rendering issues.

Change-Id: Id7bf2db2edb165542bf7a2a253c698c494278a03
Reviewed-on: https://gerrit.libreoffice.org/18014Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Tor Lillqvist <tml@collabora.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

cui/Library_cui.mk

@@ -70,6 +70,7 @@ $(eval $(call gb_Library_use_externals,cui,\
 	boost_headers \
     icuuc \
     icu_headers \
+    glew \
 ))
 
 ifeq ($(OS),WNT)

cui/source/dialogs/about.cxx

@@ -48,6 +48,7 @@
 #include <rtl/ustrbuf.hxx>
 #include <vcl/bitmap.hxx>
 #include <officecfg/Office/Common.hxx>
+#include <vcl/opengl/OpenGLHelper.hxx>
 
 using namespace ::com::sun::star::uno;
 using namespace ::com::sun::star::beans;
@@ -296,6 +297,11 @@ OUString AboutDialog::GetVersionString()
         sVersion += m_sBuildStr.replaceAll("$BUILDID", sBuildId);
     }
 
+    if (OpenGLHelper::isVCLOpenGLEnabled())
+    {
+        sVersion += "-GL";
+    }
+
     if (EXTRA_BUILDID[0] != '\0')
     {
         sVersion += "\n" EXTRA_BUILDID;