Add option to discard ULT test suite execution

Setup a new option to avoid ULT test suite run after install in order to allow cross compilation.
Append -DRUN_TEST_SUITE=OFF to the CMake command line.

Change-Id: I4974ef0a5a2c40613cde7744f66531448f9b0277

Author: DavidMarec

CMakeLists.txt

@@ -1,2 +1,7 @@
 cmake_minimum_required (VERSION 3.1 FATAL_ERROR)
+
+if (NOT DEFINED RUN_TEST_SUITE)
+option (RUN_TEST_SUITE "run test suite after install" ON)
+endif (NOT DEFINED RUN_TEST_SUITE)
+
 add_subdirectory(Source/GmmLib)

Source/GmmLib/CMakeLists.txt

@@ -544,4 +544,6 @@ if(ARCH EQUAL 32)
 	endif()
 endif()
 
-add_subdirectory(ULT)
+if(NOT DEFINED RUN_TEST_SUITE OR RUN_TEST_SUITE)
+    add_subdirectory(ULT)
+endif()