User's Guide DLL building patch

[Joshua Daniel Franklin <joshua at iocc dot com>]

Here is a patch suggested some time ago by Gerrit to
make the process of building a dll more clear:

http://sources.redhat.com/ml/cygwin/2002-08/msg01224.html

I have changed it to C instead of C++ and also added a remark
in the "Linking to DLLs" section about building your own
import lib.

ChangeLog (this is in the doc subdir):

2002-10-16  Joshua Daniel Franklin <joshuadfranklin@yahoo.com>
	* dll.sgml: Clarify discussion of building dlls.

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