[geary/wip/misc-warning-fixes: 1/2] Fix meson config warning

[Michael Gratton <mjog src gnome org>]

commit 319ea1dadac851a0ee5d9c608bdb687da6c17af3
Author: Michael Gratton <mike vee net>
Date:   Thu Jan 10 23:09:12 2019 +1100

    Fix meson config warning

 src/engine/meson.build | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/src/engine/meson.build b/src/engine/meson.build
index 796e18d1..85d256a5 100644
--- a/src/engine/meson.build
+++ b/src/engine/meson.build
@@ -365,7 +365,6 @@ geary_engine_lib = static_library('geary-engine',
 # GNOME/vala#358
 geary_engine_internal_header_fixup = custom_target(
   'geary_engine_internal_header_fixup',
-  source: geary_engine_sources,
   output: [
     'geary-engine-internal.h',
     'geary-engine-internal.vapi',