Bug#967571: Remove gtk2-devel dependency

[crvi c]

I think the gtk2-devel dependency should be removed.

Not sure why it was added in the control file in the first place ( in its
first version in 2011 )

https://salsa.debian.org/gnome-team/libdmapsharing/-/commit/9aa1b5cd32cee08d2967465ffb6e9de4ff79ce27
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