hdf5_msb

Merge pull request #2594 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:hdf5_1_10 to hdf5_1_10

* commit '22b61f470acc54afad5705dea23a7a8423e65cff':
  Revise gnu-*flags and cmake/HDF*CompilerFlags.cmake files to add warning flags for GCC compilers version 4.8 and above. Removed files from gnu-warnings that only apply to versions < 4.8. Consolidated warnings from versions < 4.8 that apply to versions >= 4.8 into the 4.8 warnings files.