opengl: build egl-headless display modular

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20201019075224.14803-14-kraxel@redhat.com

ui/meson.build

@@ -34,7 +34,6 @@ vnc_ss.add(when: sasl, if_true: files('vnc-auth-sasl.c'))
 softmmu_ss.add_all(when: vnc, if_true: vnc_ss)
 softmmu_ss.add(when: vnc, if_false: files('vnc-stubs.c'))
 softmmu_ss.add(when: [opengl, 'CONFIG_OPENGL'], if_true: files('shader.c', 'console-gl.c', 'egl-helpers.c', 'egl-context.c'))
-softmmu_ss.add(when: [opengl, 'CONFIG_OPENGL_DMABUF'], if_true: files('egl-headless.c'))
 specific_ss.add(when: ['CONFIG_SOFTMMU'], if_true: opengl)
 
 ui_modules = {}
@@ -45,6 +44,13 @@ if curses.found()
   ui_modules += {'curses' : curses_ss}
 endif
 
+if config_host.has_key('CONFIG_OPENGL_DMABUF')
+  egl_headless_ss = ss.source_set()
+  egl_headless_ss.add(when: [opengl, pixman, 'CONFIG_OPENGL_DMABUF'],
+                      if_true: files('egl-headless.c'))
+  ui_modules += {'egl-headless' : egl_headless_ss}
+endif
+
 if config_host.has_key('CONFIG_GTK')
   softmmu_ss.add(when: 'CONFIG_WIN32', if_true: files('win32-kbd-hook.c'))