[docs] Add link to gfortran wiki for binaries

[Paul Brook]

The attached patch adds a link from the "GCC Binaries" page to the gfortran 
binaries wiki page.

Ok?

Paul

2005-07-27  Paul Brook  <paul@codesourcery.com>

	* doc/install.texi: Add link to GFortran binaries wiki page.

:ADDPATCH documentation:
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