package/mesa3d: add option to configure gbm support

Kodi 18.0-Leia implements stand-alone gbm support alongside x11 &
wayland. To enable building gbm support in mesa3d without x11 &
wayland we need to add a specific configure option for it.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/mesa3d/Config.in

@@ -355,6 +355,11 @@ if BR2_PACKAGE_MESA3D_DRIVER
 
 comment "OpenGL API Support"
 
+config BR2_PACKAGE_MESA3D_GBM
+	bool "gbm"
+	help
+	  Enable Generic Buffer Management (gbm)
+
 config BR2_PACKAGE_MESA3D_OPENGL_GLX
 	bool "OpenGL GLX"
 	depends on BR2_PACKAGE_XORG7
@@ -370,6 +375,7 @@ config BR2_PACKAGE_MESA3D_OPENGL_EGL
 	bool "OpenGL EGL"
 	select BR2_PACKAGE_HAS_LIBEGL
 	select BR2_PACKAGE_HAS_LIBEGL_WAYLAND
+	select BR2_PACKAGE_MESA3D_GBM
 	help
 	  Use the Khronos EGL APIs. EGL is a window manager for OpenGL
 	  applications similar to GLX, for X, and WGL, for Windows.

package/mesa3d/mesa3d.mk

@@ -200,10 +200,17 @@ endif
 MESA3D_CONF_OPTS += \
 	-Dplatforms=$(subst $(space),$(comma),$(MESA3D_PLATFORMS))
 
+ifeq ($(BR2_PACKAGE_MESA3D_GBM),y)
+MESA3D_CONF_OPTS += \
+	-Dgbm=true
+else
+MESA3D_CONF_OPTS += \
+	-Dgbm=false
+endif
+
 ifeq ($(BR2_PACKAGE_MESA3D_OPENGL_EGL),y)
 MESA3D_PROVIDES += libegl
 MESA3D_CONF_OPTS += \
-	-Dgbm=true \
 	-Degl=true
 else
 MESA3D_CONF_OPTS += \