[gnome-terminal] build: Don't call glib-genmarshal with both --header and --body

[Christian Persch <chpe src gnome org>]

commit 0ea635f3dec365e22bf9a35313e28ca2cedbd563
Author: Christian Persch <chpe src gnome org>
Date:   Sun Oct 22 19:32:46 2017 +0200

    build: Don't call glib-genmarshal with both --header and --body
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788031

 src/Makefile.am |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 5c9f720..f7b3ecb 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -134,10 +134,10 @@ terminal-marshal.h: $(srcdir)/terminal-marshal.list
        || ( rm -f terminal-marshal.h.tmp && exit 1 )
 
 terminal-marshal.c: $(srcdir)/terminal-marshal.list
-       $(AM_V_GEN) ( $(GLIB_GENMARSHAL) --prefix=_terminal_marshal $(srcdir)/terminal-marshal.list \
-                               --header \
+       $(AM_V_GEN) ( echo '#include "terminal-marshal.h"' > terminal-marshal.c.tmp  && \
+                     $(GLIB_GENMARSHAL) --prefix=_terminal_marshal $(srcdir)/terminal-marshal.list \
                                --body \
-                               --internal > terminal-marshal.c.tmp \
+                               --internal >> terminal-marshal.c.tmp \
                && mv terminal-marshal.c.tmp terminal-marshal.c ) \
        || ( rm -f terminal-marshal.c.tmp && exit 1 )