Commits
Merging in latest from upstream (HDFFV/hdf5:refs/heads/develop) * commit 'baf7ebc4ca4eeecb11a607f420a5d5b95169eed5': Cleans warnings and cruft from ttsafe_attr_vlen.c Fixes Windows issues due to exposed pthread code
Merging in latest from upstream (HDFFV/hdf5:refs/heads/develop) * commit 'baf7ebc4ca4eeecb11a607f420a5d5b95169eed5': Cleans warnings and cruft from ttsafe_attr_vlen.c Fixes Windows issues due to exposed pthread code