PATCH: Updated build instructions for cygwin1.dll

[Dario Alcocer]

A few days back I read the following message from Chris Faylor
regarding the correct build procedure for the cygwin1.dll:

    http://cygwin.com/ml/cygwin/2001-04/msg00712.html

Since I believe these instructions are more detailed, I'd like to
submit the attached patch for how-programming.texinfo to bring the
build instructions in the FAQ up-to-date.

Comments?