Revert r24982 (Disable libsexy (with comment) if X is not available)

It's wrong, libsexy doesn't depend on an X server.

package/libsexy/Config.in

@@ -1,7 +1,6 @@
 config BR2_PACKAGE_LIBSEXY
 	bool "libsexy"
 	depends on BR2_PACKAGE_LIBGTK2
-	depends on !BR2_PACKAGE_XSERVER_none
 	help
 	  libsexy is a collection of GTK+ widgets that extend the
 	  functionality of such standard widgets as GtkEntry and
@@ -9,7 +8,3 @@ config BR2_PACKAGE_LIBSEXY
 	  limitations of the widgets.
 
 	  http://www.chipx86.com/wiki/Libsexy
-
-comment "libsexy       - disabled (requires X-Windows)"
-	depends on BR2_PACKAGE_XSERVER_none
-