spice: don't enter opengl mode in case another UI provides opengl support

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20170606110618.10393-1-kraxel@redhat.com
diff --git a/ui/spice-display.c b/ui/spice-display.c
index b353445..042292c 100644
--- a/ui/spice-display.c
+++ b/ui/spice-display.c
@@ -27,6 +27,7 @@
 #include "ui/spice-display.h"
 
 static int debug = 0;
+bool spice_opengl;
 
 static void GCC_FMT_ATTR(2, 3) dprint(int level, const char *fmt, ...)
 {
@@ -1013,7 +1014,7 @@
 
     ssd->dcl.ops = &display_listener_ops;
 #ifdef HAVE_SPICE_GL
-    if (display_opengl) {
+    if (spice_opengl) {
         ssd->dcl.ops = &display_listener_gl_ops;
         ssd->gl_unblock_bh = qemu_bh_new(qemu_spice_gl_unblock_bh, ssd);
         ssd->gl_unblock_timer = timer_new_ms(QEMU_CLOCK_REALTIME,