configure.ac: Bump GLib requirement to 2.40

Mainly for GVariantDict, useful for metadata.

Makefile.am

@@ -22,7 +22,7 @@ AM_CPPFLAGS += -DDATADIR='"$(datadir)"' -DLIBEXECDIR='"$(libexecdir)"' \
 	-DLOCALEDIR=\"$(datadir)/locale\" -DSYSCONFDIR=\"$(sysconfdir)\" \
 	-DGPGVPATH=\"$(GPGVPATH)\" \
 	-DOSTREE_FEATURES='"$(OSTREE_FEATURES)"' \
-	-DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_36 -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_36 \
+	-DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_40 -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_40 \
 	-DSOUP_VERSION_MIN_REQUIRED=SOUP_VERSION_2_40 -DSOUP_VERSION_MAX_ALLOWED=SOUP_VERSION_2_48
 AM_CFLAGS += $(WARN_CFLAGS)
 DISTCHECK_CONFIGURE_FLAGS += --enable-gtk-doc --disable-maintainer-mode

configure.ac

@@ -43,7 +43,7 @@ AC_CHECK_HEADER([attr/xattr.h],,[AC_MSG_ERROR([You must have attr/xattr.h from l
 
 PKG_PROG_PKG_CONFIG
 
-GIO_DEPENDENCY="gio-unix-2.0 >= 2.36.0 libgsystem >= 2015.1"
+GIO_DEPENDENCY="gio-unix-2.0 >= 2.40.0 libgsystem >= 2015.1"
 PKG_CHECK_MODULES(OT_DEP_GIO_UNIX, $GIO_DEPENDENCY)
 
 dnl 5.1.0 is an arbitrary version here

src/libotutil/ot-variant-utils.c

@@ -280,15 +280,7 @@ ot_variant_new_from_bytes (const GVariantType  *type,
                            GBytes        *bytes,
                            gboolean       trusted)
 {
-#if GLIB_VERSION_MIN_REQUIRED >= GLIB_VERSION_2_36
   return g_variant_new_from_bytes (type, bytes, trusted);
-#else
-  gsize size;
-  gconstpointer data = g_bytes_get_data (bytes, &size);
-  g_bytes_ref (bytes);
-  return g_variant_new_from_data (type, data, size, trusted,
-                                  (GDestroyNotify)g_bytes_unref, bytes);
-#endif
 }
 
 /**