libgbm: make possible to use other libgbm provides than mesa

Mesa is the default libgbm provider, but does not yet have virtual/libgbm
in the PROVIDES list. This makes it difficult the change the dependency
to another recipes that provide only libgbm. Add virtual/libgbm to mesa
and TI's libgbm recipe, and change the dependency in qtbase.

Add gbm to qtbase PACKAGECONFIG on intel devices.

Task-number: QTBUG-57896
Change-Id: I491df7057e52f9e74dd87abf65e542eab2cd3f9e
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
Reviewed-by: Mikko Gronoff <mikko.gronoff@qt.io>

meta-intel-extras/recipes/recipes-qt/qtbase_git.bbappend

@@ -27,4 +27,4 @@
 ##
 ############################################################################
 
-PACKAGECONFIG += "kms"
+PACKAGECONFIG += "gbm kms"

meta-ti-extras/recipes/gbm/libgbm_%.bbappend

+############################################################################
+##
+## Copyright (C) 2017 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of the Boot to Qt meta layer.
+##
+## $QT_BEGIN_LICENSE:GPL$
+## Commercial License Usage
+## Licensees holding valid commercial Qt licenses may use this file in
+## accordance with the commercial license agreement provided with the
+## Software or, alternatively, in accordance with the terms contained in
+## a written agreement between you and The Qt Company. For licensing terms
+## and conditions see https://www.qt.io/terms-conditions. For further
+## information use the contact form at https://www.qt.io/contact-us.
+##
+## GNU General Public License Usage
+## Alternatively, this file may be used under the terms of the GNU
+## General Public License version 3 or (at your option) any later version
+## approved by the KDE Free Qt Foundation. The licenses are as published by
+## the Free Software Foundation and appearing in the file LICENSE.GPL3
+## included in the packaging of this file. Please review the following
+## information to ensure the GNU General Public License requirements will
+## be met: https://www.gnu.org/licenses/gpl-3.0.html.
+##
+## $QT_END_LICENSE$
+##
+############################################################################
+
+PROVIDES += "virtual/libgbm"

recipes-qt/qt5/qtbase_git.bbappend

@@ -58,3 +58,6 @@ do_configure_prepend() {
 }
 
 SRCREV = "179045f36a16ce2f6cfaad1dbd9443b52b1bf8d3"
+
+# make other libgbm providers possible
+PACKAGECONFIG[gbm] = "-gbm,-no-gbm,virtual/libgbm"

recipes/mesa/mesa_%.bbappend

@@ -28,3 +28,4 @@
 ############################################################################
 
 RDEPENDS_libgles2-mesa-dev += "libgles3-mesa-dev"
+PROVIDES += "virtual/libgbm"