[gcr] gcr/meson.build: fix one parallel build failure

[Niels De Graef <nielsdg src gnome org>]

commit 6058f0378ea91024af32c9dc42d3afde1bac3da8
Author: Changqing Li <changqing li windriver com>
Date:   Fri Apr 23 17:16:14 2021 +0800

    gcr/meson.build: fix one parallel build failure
    
    ui/gcr-live-search.c includes gcr/gcr-marshal.h. Because missing
    dependency, following error occurred intermittently during doing parallel
    build:
    
     -o ui/libgcr-ui-3.so.1.0.0.p/gcr-live-search.c.o -c ../gcr-3.38.1/ui/gcr-live-search.c
    ../gcr-3.38.1/ui/gcr-live-search.c:32:10: fatal error: gcr/gcr-marshal.h: No such file or directory
       32 | #include "gcr/gcr-marshal.h"
          |          ^~~~~~~~~~~~~~~~~~~
    compilation terminated.
    
    Signed-off-by: Changqing Li <changqing li windriver com>

 gcr/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gcr/meson.build b/gcr/meson.build
index 7a3b69a..2233a44 100644
--- a/gcr/meson.build
+++ b/gcr/meson.build
@@ -181,6 +181,7 @@ gcr_base_dep = declare_dependency(
   sources: [
     gcr_enums_gen[1],
     gcr_oids[1],
+    gcr_marshal_gen[1],
   ],
 )