package/cog: add libgbm as dependency when building with DRM support

When building with the DRM support, it can happen that the libgbm library
is not yet built by the provider of this lib (specified by
BR2_PACKAGE_PROVIDES_LIBGBM).

The docs in cog `docs/platform-drm.md` specify this dep-list:
- **WPEBackend-fdo**:
- **Wayland**:
- **libdrm**:
- **libgbm**:
- **libinput**:
- **libudev**:

libgbm needs to be added.
Adding libegl as well.

Updated package/cog/Config.in to define the dependencies (for DRM)
according to libegl & libgbm.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 1d207e4c3c)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/cog/Config.in

@@ -39,7 +39,8 @@ config BR2_PACKAGE_COG_PLATFORM_FDO
 config BR2_PACKAGE_COG_PLATFORM_DRM
 	bool "DRM backend"
 	depends on BR2_PACKAGE_HAS_UDEV # libinput
-	depends on BR2_PACKAGE_MESA3D_OPENGL_EGL # gbm
+	depends on BR2_PACKAGE_HAS_LIBEGL
+	depends on BR2_PACKAGE_HAS_LIBGBM
 	select BR2_PACKAGE_LIBDRM
 	select BR2_PACKAGE_LIBINPUT
 	help
@@ -52,7 +53,9 @@ config BR2_PACKAGE_COG_USE_SYSTEM_DBUS
 	help
 	  Expose remote control interface on system bus
 
-comment "DRM platform needs mesa3d w/ EGL driver and GBM"
-	depends on !BR2_PACKAGE_MESA3D_OPENGL_EGL
+comment "DRM platform needs EGL and GBM"
+	depends on \
+		!BR2_PACKAGE_HAS_LIBEGL || \
+		!BR2_PACKAGE_HAS_LIBGBM
 
 endif

package/cog/cog.mk

@@ -28,7 +28,7 @@ endif
 
 ifeq ($(BR2_PACKAGE_COG_PLATFORM_DRM),y)
 COG_CONF_OPTS += -DCOG_PLATFORM_DRM=ON
-COG_DEPENDENCIES += libdrm libinput
+COG_DEPENDENCIES += libdrm libinput libgbm libegl
 else
 COG_CONF_OPTS += -DCOG_PLATFORM_DRM=OFF
 endif