Disable EGLWLMockNavigation example build

The EGLWLMockNavigation example code has build issues on TI platforms.
To avoid needing to patch it just for those platforms, just disable
building it since there are no known users inside AGL.

Upstream-Status: Inappropriate [disable feature]

Signed-off-by: Scott Murray <scott.murray@konsulko.com>

diff --git a/ivi-layermanagement-examples/CMakeLists.txt b/ivi-layermanagement-examples/CMakeLists.txt
index 1eab8e9..48bdffd 100644
--- a/ivi-layermanagement-examples/CMakeLists.txt
+++ b/ivi-layermanagement-examples/CMakeLists.txt
@@ -24,7 +24,6 @@ project (ivi-layermanagement-examples)
 # cmake configuration
 #===========================================================================================================
 add_subdirectory(LayerManagerControl)
-add_subdirectory(EGLWLMockNavigation)
 add_subdirectory(EGLWLInputEventExample)
 add_subdirectory(layer-add-surfaces)
 add_subdirectory(multi-touch-viewer)