Use libglnx

Starting down the path of not using libgsystem.  The main win here
will be code sharing between ostree/rpm-ostree as well as going down
the path of not using GFile * for local files.

src/libostree/ostree-core.c

@@ -31,6 +31,7 @@
 #include "ostree-chain-input-stream.h"
 #include "otutil.h"
 #include "libgsystem.h"
+#include "libglnx.h"
 
 #define ALIGN_VALUE(this, boundary) \
   (( ((unsigned long)(this)) + (((unsigned long)(boundary)) -1)) & (~(((unsigned long)(boundary))-1)))
@@ -209,7 +210,7 @@ file_header_new (GFileInfo         *file_info,
   guint32 mode;
   const char *symlink_target;
   GVariant *ret;
-  gs_unref_variant GVariant *tmp_xattrs = NULL;
+  g_autoptr(GVariant) tmp_xattrs = NULL;
 
   uid = g_file_info_get_attribute_uint32 (file_info, "unix::uid");
   gid = g_file_info_get_attribute_uint32 (file_info, "unix::gid");

src/libotutil/ot-variant-utils.c

@@ -133,7 +133,7 @@ ot_util_variant_map (GFile              *src,
                      GError            **error)
 {
   gboolean ret = FALSE;
-  gs_unref_variant GVariant *ret_variant = NULL;
+  g_autoptr(GVariant) ret_variant = NULL;
   GMappedFile *mfile = NULL;
 
   mfile = gs_file_map_noatime (src, NULL, error);

src/libotutil/otutil.h

@@ -26,6 +26,7 @@
 #include <libgsystem.h>
 #include <string.h> /* Yeah...let's just do that here. */
 #include <gsystem-local-alloc.h>
+#include <libglnx.h>
 
 #define ot_gobject_refz(o) (o ? g_object_ref (o) : o)
 

src/ostree/ot-admin-functions.c

@@ -61,7 +61,7 @@ ot_admin_require_booted_deployment_or_osname (OstreeSysroot       *sysroot,
 char *
 ot_admin_checksum_version (GVariant *checksum)
 {
-  gs_unref_variant GVariant *metadata = NULL;
+  g_autoptr(GVariant) metadata = NULL;
   const char *ret = NULL;
 
   metadata = g_variant_get_child_value (checksum, 0);

src/ostree/ot-main.c

@@ -27,6 +27,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <libglnx.h>
+
 #include "ostree.h"
 #include "ot-main.h"
 #include "otutil.h"
@@ -230,7 +232,7 @@ ostree_option_context_parse (GOptionContext *context,
                              GCancellable *cancellable,
                              GError **error)
 {
-  gs_unref_object OstreeRepo *repo = NULL;
+  glnx_unref_object OstreeRepo *repo = NULL;
   gboolean success = FALSE;
 
   /* Entries are listed in --help output in the order added.  We add the