ofz#887 support avoiding reading config

Change-Id: Ic7e0e65b15c7b6a01a10d6004230ad71a2d439d2

canvas/Library_canvasfactory.mk

@@ -29,6 +29,7 @@ $(eval $(call gb_Library_use_libraries,canvasfactory,\
 	cppu \
 	cppuhelper \
 	sal \
+	utl \
 	vcl \
 	$(gb_UWINAPI) \
 ))

canvas/source/factory/cf_service.cxx

@@ -43,6 +43,7 @@
 #if HAVE_FEATURE_OPENGL
 #include <vcl/opengl/OpenGLWrapper.hxx>
 #endif
+#include <unotools/configmgr.hxx>
 
 using namespace ::com::sun::star;
 using namespace ::com::sun::star::uno;
@@ -122,6 +123,8 @@ CanvasFactory::CanvasFactory( Reference<XComponentContext> const & xContext ) :
     m_bCacheHasForcedLastImpl(),
     m_bCacheHasUseAcceleratedEntry(),
     m_bCacheHasUseAAEntry()
+{
+    if (!utl::ConfigManager::IsAvoidConfig())
     {
         try
         {
@@ -191,6 +194,7 @@ CanvasFactory::CanvasFactory( Reference<XComponentContext> const & xContext ) :
         catch (const Exception&)
         {
         }
+    }
 
     if (m_aAvailableImplementations.empty())
     {