i686.README: reference more correct lib32gfortran-6-dev package

Author: vtjnash

README.md

@@ -185,7 +185,7 @@ Julia does not install anything outside the directory it was cloned into. Julia
 
 Julia can be built for a non-generic architecture by configuring the `ARCH` Makefile variable. See the appropriate section of `Make.inc` for additional customization options, such as `MARCH` and `JULIA_CPU_TARGET`.
 
-For example, to build for Pentium 4, set `MARCH=pentium4` and install the necessary system libraries for linking. On Ubuntu, these may include lib32gfortran3 (also manually call `ln -s /usr/lib32/libgfortran3.so.0 /usr/lib32/libgfortran3.so`) and lib32gcc1, lib32stdc++6, among others.
+For example, to build for Pentium 4, set `MARCH=pentium4` and install the necessary system libraries for linking. On Ubuntu, these may include lib32gfortran-6-dev, lib32gcc1, and lib32stdc++6, among others.
 
 You can also set `MARCH=native` for a maximum-performance build customized for the current machine CPU.