STORM-987: Make building of llimage_libtest optional so that builf failure on...

STORM-987: Make building of llimage_libtest optional so that builf failure on Linux doesn't block autobuild merge

indra/integration_tests/CMakeLists.txt

 # -*- cmake -*-
 
 add_subdirectory(llui_libtest)
-add_subdirectory(llimage_libtest)
+if (LLIMAGE_LIBTEST)
+  add_subdirectory(llimage_libtest)
+endif (LLIMAGE_LIBTEST)

indra/integration_tests/llimage_libtest/CMakeLists.txt

@@ -53,9 +53,9 @@ if (DARWIN)
   find_library(COREFOUNDATION_LIBRARY CoreFoundation)
   set(OS_LIBRARIES ${COREFOUNDATION_LIBRARY})
 elseif (WINDOWS)
-#  set(OS_LIBRARIES)
+  set(OS_LIBRARIES)
 elseif (LINUX)
-#  set(OS_LIBRARIES)
+  set(OS_LIBRARIES)
 else (DARWIN)
   message(FATAL_ERROR "Unknown platform")
 endif (DARWIN)