Import presentproto-1.0 as x11/presentproto.

The Present extension provides a way for applications to update
their window contents from a pixmap in a well defined fashion,
synchronizing with the display refresh and potentially using a more
efficient mechanism than copying the contents of the source pixmap.
+ presentproto
Added x11/presentproto version 1.0
Import dri3proto-1.0 as x11/dri3proto.

The DRI3 extension provides mechanisms to translate between direct
rendered buffers and X pixmaps. When combined with the Present
extension, a complete direct rendering solution for OpenGL is
provided.

The direct rendered buffers are passed across the protocol via
standard POSIX file descriptor passing mechanisms. On Linux, these
buffers are DMA-BUF objects.

DRI3 also includes a mechanism to translate between Linux Futexes
and X Sync extension Fences. This provides a synchronization
mechanism which can be used to serialize access to shared render
buffers.
+ dri3proto
Added x11/dri3proto version 1.0
Add dri3proto and presentproto.
Bump version.
Updated meta-pkgs/modular-xorg-protos to 1.5
Update HOMEPAGE.
Updated x11/lablgtk to its newest version, 2.18. Changes include:

  * update applications for 4.01
  * various fixes in windows port
  * add some GTK enumerations and update stock icon list
  * add properties GtkTreeView.enable_{tree,grid}_lines
  * add properties GtkEntry.{primary,secondary}_icon_{stock,name,pixbuf},
    see examples/entry2.ml for usage
  * add tags in GtkMovementStep
  * fix compatibility with ocaml 4.01 (?lab for non-optional arguments)
  * add handling of new modifiers
  * detect findlib during configuration
  * support DESTDIR with findlib-install
  * have old-install copy the META file too
  * cleanup the two phases of findlib-install
x11/lablgtk -> 2.18.0