[gegl] meson: use "debugoptimized" as the default build type

[Ell <ell src gnome org>]

commit ed8bcf2e49090bcc8799c2c881367979d63af391
Author: Ell <ell_se yahoo com>
Date:   Fri Oct 25 17:16:05 2019 +0300

    meson: use "debugoptimized" as the default build type
    
    ... to match the default autotools behavior.

 meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/meson.build b/meson.build
index 000eba9a8..c5acc2951 100644
--- a/meson.build
+++ b/meson.build
@@ -6,6 +6,7 @@ project('gegl',
   default_options: [
     'c_std=gnu11',
     'cpp_std=gnu++14',
+    'buildtype=debugoptimized',
   ],
 )