Linker documentation patch

[Ian Lance Taylor]

   Date: Fri, 7 Jan 2000 11:07:35 -0800
   From: Nick Clifton <nickc@cygnus.com>

   + Note - if the linker is being invoked indirectly, via a compiler driver
   + (eg @samp{gcc}) then all the linker command line options should be
   + prefixed by @samp{-Wl,}  like this:

I would change this to indicate that -Wl is actually compiler
specific.  There are other compilers which support -Wl, but there also
plenty which don't.

Ian