update to latest version of uthash

To fix warning messages with recent compilers (e.g., GCC 7) the files
uthash.h and utlist.h have been updated to the latest version, see also
CQ #15163 [1].

[1] https://dev.eclipse.org/ipzilla/show_bug.cgi?id=15163

Change-Id: I28712b3c5bfcbd017b7c3d2d92f72f0270868676
2 files changed