fix finduuid for macOS

This partially reverts commit 52b2210.

Author: duncanmmacleod

cmake/FindUUID.cmake

@@ -13,6 +13,13 @@
 #  For details see the accompanying COPYING-CMAKE-SCRIPTS file.
 #
 
+if (APPLE)
+  include(CheckSymbolExists)
+  # On mac, it can't find uuid library
+  # So, just check for the functions with the default include
+  CHECK_SYMBOL_EXISTS("uuid_generate" "uuid/uuid.h" UUID_SYMBOL)
+endif (APPLE)
+
 if (UUID_SYMBOL)
   set(UUID_FOUND TRUE)
 elseif (UUID_LIBRARIES AND UUID_INCLUDE_DIRS)