[eog] build: Modernize glib-genmarshal usage

[Felix Riemann <friemann src gnome org>]

commit 9fe34b11eedbec4a294168a6a4936cf66702bef0
Author: Felix Riemann <friemann gnome org>
Date:   Wed Nov 8 22:37:54 2017 +0100

    build: Modernize glib-genmarshal usage
    
    This makes uses of the improved glib-genmarshal commandline
    in preparation for the upcoming Meson build which will behave similar.

 configure.ac    |    2 +-
 src/Makefile.am |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 56fd23e..172129f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -85,7 +85,7 @@ YELP_HELP_INIT
 # **********
 
 GTK_REQUIRED=3.22.0
-GLIB_REQUIRED=2.42.0
+GLIB_REQUIRED=2.53.4
 GNOME_DESKTOP_REQUIRED=2.91.2
 GDKPIXBUF_REQUIRED=2.36.5
 GTK_PRINT_REQUIRED=3.5.4
diff --git a/src/Makefile.am b/src/Makefile.am
index 735dbd4..8bb1b94 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -198,7 +198,7 @@ eog-marshal.h: eog-marshal.list $(GLIB_GENMARSHAL)
        $(AM_V_GEN)$(GLIB_GENMARSHAL) $< --header --internal --prefix=eog_marshal > $@
 
 eog-marshal.c: eog-marshal.list $(GLIB_GENMARSHAL)
-       $(AM_V_GEN)$(GLIB_GENMARSHAL) $< --body --header --prefix=eog_marshal > $@
+       $(AM_V_GEN)$(GLIB_GENMARSHAL) $< --prototypes --body --prefix=eog_marshal > $@
 
 EXTRA_DIST =                           \
        eog.gresource.xml               \