Commits
Merge pull request #2762 in HDFFV/hdf5 from ~DEROBINS/hdf5_der:develop_minor to develop * commit 'b806f3e9acad6261438dacecbb11a87bcd644e72': Tweak to hide unused threadsafe callback in non-threadsafe builds
Merge pull request #2762 in HDFFV/hdf5 from ~DEROBINS/hdf5_der:develop_minor to develop * commit 'b806f3e9acad6261438dacecbb11a87bcd644e72': Tweak to hide unused threadsafe callback in non-threadsafe builds