Gtk Background Dialog: properly get the color on close with the new color chooser widget.

Cherry-pick from trunk@35029

git-svn-id: svn+ssh://svn.abisource.com/svnroot/abiword/branches/ABI-3-0-0-STABLE@35031 bcba8976-2d24-0410-9c9c-aab3bd5fdfd6
Bug 12577 - Missing Makefile creation

git-svn-id: svn+ssh://svn.abisource.com/svnroot/abiword/branches/ABI-3-0-0-STABLE@35032 bcba8976-2d24-0410-9c9c-aab3bd5fdfd6
Gtk Dialogs Background and options: fix the color chooser.

git-svn-id: svn+ssh://svn.abisource.com/svnroot/abiword/branches/ABI-3-0-0-STABLE@35033 bcba8976-2d24-0410-9c9c-aab3bd5fdfd6