hdf5_ep

[svn-r1525] configure.in:
    Added the checking for zlib and jpeg libraries when doing the -with-hdf4
    option.  HDF4 applications in general needs lib mfhdf, df, z, and jpeg.
    Removed the earlier alone test for jpeg.  It conflicted with the hdf4
    tests.  Also, moved the hdf5-own library test for zlib after the hdf4
    tests so that when hdf4 is used, the results would cover the zlib
    test.
configure:
    derived from configure.in by autoconf.

Platforms tested:
    IRIX 6.5, IRIX64 6.5, Solaris 2.6 (with default gcc, tested h5toh4
    tool).

Comments:
    This still generates compile commands that listed the "-lmfhdf ..."
    library list before the -L/usr/ncsa/lib.  I traced the problem to
    the libtool.  (I stopped at the door and dared not to enter this
    libtool cave. :-)  Most compilers, except solaris' cc, tolerate
    the "duplicated" library list.