Add script 'get_dlibcurl32', to auto-create Win32 libcurl import lib.
get_dlibcurl32: Only download implib if not already installed.
get_dlibcurl32: Couple minor cleanups.
get_dlibcurl32: Add message directing user to output directory.
Merge pull request #79 from Abscissa/get_dlibcurl32

Add script 'get_dlibcurl32', to auto-create Win32 libcurl import lib.