Add xcb-xinput to 3rd party libs

The added xcb-xinput code was produced by build of libxcb 1.13
with xcb-proto 1.13.
The following parts were removed from it:
 - Pointer Barriers API (requires xcb-xfixes 1.9 with xcb-proto 1.9)
 - SendExtensionEvent API (requires definition of xcb_raw_generic_event_t
   from libxcb 1.13)

[ChangeLog][Third-Party Code] Sources of xcb-xinput 1.13 were bundled and
are available via -qt-xcb.

Change-Id: I43d2f43bee0ba874d099c9fb858e74b0e3edc970
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>

src/3rdparty/xcb/README

@@ -4,6 +4,8 @@ Contains the header and sources files from selected xcb libraries:
        xfixes, xinerama sources)
    # libxkbcommon-x11 requires libxcb-xkb >= 1.10
    libxcb-1.10 together with xcb-proto-1.10 (xkb sources)
+   libxcb-1.13 together with xcb-proto-1.13 (xinput sources with removed
+       Pointer Barriers API and SendExtensionEvent API)
    libxcb-util-image-0.3.9
    libxcb-util-keysyms-0.3.9
    libxcb-util-renderutil-0.3.8

src/plugins/platforms/xcb/xcb-static/xcb-static.pro

@@ -2,7 +2,7 @@
 # Statically compile in code for
 # libxcb-fixes, libxcb-randr, libxcb-shm, libxcb-sync, libxcb-image,
 # libxcb-keysyms, libxcb-icccm, libxcb-renderutil, libxcb-xkb,
-# libxcb-xinerama
+# libxcb-xinerama, libxcb-xinput
 #
 CONFIG += static
 
@@ -29,7 +29,8 @@ SOURCES += \
     $$LIBXCB_DIR/render.c \
     $$LIBXCB_DIR/shape.c \
     $$LIBXCB_DIR/xkb.c \
-    $$LIBXCB_DIR/xinerama.c
+    $$LIBXCB_DIR/xinerama.c \
+    $$LIBXCB_DIR/xinput.c
 
 #
 # xcb-util