Set awk and find used in run-octave from configure

[Moritz Borgmann]

>I made these changes.  I wasn't able to apply the patches
>automatically.  In the future, please send patches as text/plain
>attachments to avoid line wrapping mailers.

good point. Sorry for the unnecessary hassle.

>| +# OCTAVE_PROG_FIND
>| +# ----------------
>| +# Check for gfind first since it's generally better.
>| +AN_MAKEVAR([FIND],  [OCTAVE_PROG_FIND])
>| +AN_PROGRAM([gfind], [OCTAVE_PROG_FIND])
>| +AN_PROGRAM([find],  [OCTAVE_PROG_FIND])
>| +AC_DEFUN([OCTAVE_PROG_FIND],
>| +[AC_CHECK_PROGS(FIND, gfind find, )])
>
>If this is a better way of checking for programs compared to what we
>do now, then it would be useful if someone would look at converting
>the existing tests to use this style.

sorry, even though I came up with it, I have no experience with 
autoconfig, so I can't really comment on if it's better or not. It's 
a shameless plug from the code for setting AWK in autoconf's 
share/autoconf/autoconf/programs.m4. What counted for me that it 
seems to work well...

Cheers,

Moritz