hdf5_chunking_query_bmr

[svn-r22774] The matching configure file
Use 
  LT_PREREQ([2.2])
  LT_INIT([dlopen])
instead of
  AC_LIBTOOL_DLOPEN
  AM_PROG_LIBTOOL

Also add ALLOW_UNSUPPORTED on threadsafe check

Both from 1.8 configure