hdf5_chunking_query_bmr

Merge pull request #2526 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:hdf5_1_8 to hdf5_1_8

* commit '93b69eaec2e21543269575fb79bf8f25b74f96d3':
  Restrict errors to gcc 4.8 and above.
  Move ADD_H5_FLAGS macro from *CompilerFlags.cmake files to config/cmake_ext_mod/HDFMacros.cmake for common use.
  Fix NoFilter build
  TRILAB-244 separate CXX warnings and errors from C
  Don't add general warnings flags for unsupported old versions of gcc and g++ (older than gcc/g++ 4.2). Correct gnu-cxxflags to determine warnings flags to be added based on C++ compiler version instead of C compiler version.