targets/dri: Add __driDriverGetExtensions_freedreno symbol

Identical to previous two commits - will bring us a step closer
to megadrivers.

Cc: Rob Clark <robclark@freedesktop.org>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Tested-by: Rob Clark <robclark@freedesktop.org>
Tested-by: Thomas Helland <thomashelland90 at gmail.com>
Acked-by: Tom Stellard <thomas.stellard@amd.com>

src/gallium/auxiliary/target-helpers/inline_drm_helper.h

@@ -191,6 +191,18 @@ pipe_vmwgfx_create_screen(int fd)
 #endif
 
 #if defined(GALLIUM_FREEDRENO)
+#if defined(DRI_TARGET)
+#include "dri_screen.h"
+
+const __DRIextension **__driDriverGetExtensions_freedreno(void);
+
+PUBLIC const __DRIextension **__driDriverGetExtensions_freedreno(void)
+{
+   globalDriverAPI = &galliumdrm_driver_api;
+   return galliumdrm_driver_extensions;
+}
+#endif
+
 static struct pipe_screen *
 pipe_freedreno_create_screen(int fd)
 {

src/gallium/targets/dri/Makefile.am

@@ -23,6 +23,11 @@ AM_CPPFLAGS += \
 	-DDRI_TARGET
 endif
 
+if HAVE_GALLIUM_FREEDRENO
+AM_CPPFLAGS += \
+	-DDRI_TARGET
+endif
+
 dridir = $(DRI_DRIVER_INSTALL_DIR)
 dri_LTLIBRARIES = gallium_dri.la