patch docs to suggest using LD_LIBRARY_PATH to find libgmp.so etc.

[Jonathan Wakely]

Here's a new patch with Ralf's improved wording.

2010-09-27  Jonathan Wakely  <jwakely.gcc@gmail.com>
            Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * doc/install.texi: Suggest using LD_LIBRARY_PATH to find libs
        for GMP, MPFR and MPC.

OK for trunk?
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