- perf_mbytes is a global used later in pdf generation, do not overwrite
  in stdio output parsing

- these cannot be easily translated into Darshan 3.1.x format
- fixes #241

- reported by Jialin Liu
- triggered by some HDF5 programs
- solved by eliminating incomplete wrapper mechanisms for H5get_libversion()
  and invoking it directly (Darshan needs to use, not wrap, this
  function)

see #223

Anonymous mmap() calls have no backing file and therefore won't match
any Darshan characterization records, so we can skip the record lookup
in this case.  This also fixes a deadlock on Cray systems with hugepages
enabled, see #210.

Otherwise, compile errors are generated when building an external
tool that uses the darshan-logutils api/library.

- provided by Huong Luu

- contributed by Kay Thust

- this ensures that link-time instrumentation is only added to static
  executables in Cray environments.  Reported by Kalyana Chadalavada.

- no documentation or extensive testing yet