patch for LD_PRELOAD compatibility on cygwin

[Marco Atzeri]

Dear All,
the attached patch solve the LD_PRELOAD fault on cygwin
and it should be compatible with all the other systems.

It is just a change of separator from space to ":" and
inversion of the lib order:

-LD_PRELOAD="$liboctinterp $liboctave $libcruft" \
+LD_PRELOAD="$libcruft:$liboctave:$liboctinterp" \

I also added the full explanation and an altenative 
solution on the README.Cygwin .

If this change should cause any problem on other systems
than only the change on README.Cygwin should be applied.

Regards
Marco

hg_preload.patch
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