[gegl] meson: add sdl2-display op

[Øyvind "pippin" Kolås <ok src gnome org>]

commit d6c6c841abe2980209cd708b0a72c34a03ced7b9
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Aug 13 17:11:56 2019 +0200

    meson: add sdl2-display op

 operations/external/meson.build | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/operations/external/meson.build b/operations/external/meson.build
index 4e54bc6ef..2bc79271f 100644
--- a/operations/external/meson.build
+++ b/operations/external/meson.build
@@ -60,6 +60,10 @@ if sdl1.found()
   operations += { 'name': 'sdl-display', 'deps': sdl1 }
 endif
 
+if sdl2.found()
+  operations += { 'name': 'sdl2-display', 'deps': sdl2 }
+endif
+
 if libraw.found()
   operations += { 'name': 'raw-load', 'deps': libraw }
 endif