4159:: Check if Fortran's default real is double precision. If it is and HL is being built then configure should fail due to bug HDFFV-889.
Fix:
This check should be located where HL is check for, and it is. Updated the comment to elimenate confusion.
Change AC_TRY_RUN TO AC_TRY_COMPILE
Changed all the instances of AC_TRY_RUN for the Fortran and C++ tests to use
AC_COMPILE_IFELSE and moved all the tests to new files in m4 directory:
aclocal_cxx.m4 (for C++ tests)
aclocal_fc.m4 (for Fortran tests)
tested: jam