Move the errors/f77/errhan directory to an iodir.
The test file was using MPI-I/O functions that the MPICH test suite allows us to enable/disable. This patch moves the test to an iodir format, so it is not run when configured with --disable-romio. The correct longer term fix for this is to allow multiple conditions to disable a given test. For example, we could have configure set the @enable_io@ macro to either '' or '#', and different tests that rely on I/O would add them to the start of the line in the test file. That way, a test that uses both F77 and I/O would be disabled when support for either one is not present. Signed-off-by: Junchao Zhang <firstname.lastname@example.org>