Substitute deprecated Glib symbol: g_mapped_file_free

glib-compat.h file created to use g_mapped_file_unref only if
glib >= 2.22 is available

https://bugzilla.gnome.org/show_bug.cgi?id=603727

Makefile.am

@@ -9,16 +9,17 @@ lib_LTLIBRARIES = libgirepository-1.0.la
 noinst_LTLIBRARIES = libgirepository-parser.la
 
 libgirepository_1_0_la_SOURCES =		\
-	girepository.c				\
-	gtypelib.h				\
-	gtypelib.c				\
+	gdump.c					\
 	gfield.c				\
-	ginfo.h					\
 	ginfo.c                                 \
+	ginfo.h                                 \
+	ginvoke.c				\
+	girepository.c				\
 	girffi.c                                \
 	girffi.h                                \
-	gdump.c					\
-	ginvoke.c
+	glib-compat.h                           \
+	gtypelib.c				\
+	gtypelib.h
 
 libgirepository_1_0_la_CPPFLAGS = $(GIREPO_CFLAGS)
 libgirepository_1_0_la_LIBADD = $(GIREPO_LIBS)

girepository.c

@@ -31,6 +31,7 @@
 #include "girepository.h"
 #include "gtypelib.h"
 #include "ginfo.h"
+#include "glib-compat.h"
 
 #include "config.h"
 
@@ -1039,7 +1040,7 @@ compare_candidate_reverse (struct NamespaceVersionCandidadate *c1,
 static void
 free_candidate (struct NamespaceVersionCandidadate *candidate)
 {
-  g_mapped_file_free (candidate->mfile);
+  g_mapped_file_unref (candidate->mfile);
   g_free (candidate->path);
   g_free (candidate->version);
   g_free (candidate);

glib-compat.h

@@ -0,0 +1,24 @@
+/* GObject introspection: Compatibility definitions
+ *
+ * Copyright (C) 2009 Javier Jardón
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#if !GLIB_CHECK_VERSION(2,22,0)
+#define g_mapped_file_unref(x) g_mapped_file_free(x)
+#endif

gtypelib.c

@@ -26,6 +26,7 @@
 
 #include "config.h"
 #include "gtypelib.h"
+#include "glib-compat.h"
 
 typedef struct {
   GTypelib *typelib;
@@ -2134,7 +2135,7 @@ void
 g_typelib_free (GTypelib *typelib)
 {
   if (typelib->mfile)
-    g_mapped_file_free (typelib->mfile);
+    g_mapped_file_unref (typelib->mfile);
   else
     if (typelib->owns_memory)
       g_free (typelib->data);