Use dlopen() to choose gtk2 or gtk3 at runtime - a simple demo

[Wen-Yen Chuang <caleb calno com>]

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Hello,

I am not an expert at C, but I wrote a simple demo to support gtk2 and
gtk3 at the same time.

My program only links to glib, and uses dlopen() to find system GTK+.

The build-time needs only one GTK+ (gtk2 or gtk3), and the binary can
run happily with both gtk2 runtime and gtk3 runtime.

It is easy and interesting. I think some of you may want to write
another program to do similar things. :-)

Introduction:
http://evilvte.blogspot.com/2011/10/trick-gtk2-gtk3-coexist.html
Download link is listed at right side of the blog.

Kind regards
 Wen-Yen Chuang (caleb)
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