[libgsf: 1/2] Include <sys/stat.h> instead of "struct stat" forward declaration

[Morten Welinder <mortenw src gnome org>]

commit 8d195ddb4f2d2fe87723faedb2c6daa3dd4c4f87
Author: Kouhei Sutou <kou clear-code com>
Date:   Wed Jun 6 15:37:19 2018 +0900

    Include <sys/stat.h> instead of "struct stat" forward declaration
    
    It causes a build error with MinGW:
    
          CC       gsf-input.lo
        gsf-input.c:632:1: error: conflicting types for 'gsf_input_set_modtime_from_stat'
         gsf_input_set_modtime_from_stat (GsfInput *input,
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        In file included from ../gsf/gsf.h:54:0,
                         from gsf-input.c:24:
        ../gsf/gsf-input-impl.h:67:10: note: previous declaration of 'gsf_input_set_modtime_from_stat' was 
here
         gboolean gsf_input_set_modtime_from_stat (GsfInput *input,
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        Makefile:705: recipe for target 'gsf-input.lo' failed
    
    <sys/stat.h> is enough portable because glib/gstdio.h uses it.

 gsf/gsf-input-impl.h | 3 ++-
 gsf/gsf-input.c      | 1 -
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gsf/gsf-input-impl.h b/gsf/gsf-input-impl.h
index 2f08e91..c8fb6c4 100644
--- a/gsf/gsf-input-impl.h
+++ b/gsf/gsf-input-impl.h
@@ -22,6 +22,8 @@
 #ifndef GSF_INPUT_IMPL_H
 #define GSF_INPUT_IMPL_H
 
+#include <sys/stat.h>
+
 #include <gsf/gsf-fwd.h>
 
 G_BEGIN_DECLS
@@ -63,7 +65,6 @@ gboolean gsf_input_set_size    (GsfInput *input, gsf_off_t size);
 gboolean gsf_input_set_modtime   (GsfInput *input, GDateTime *modtime);
 gboolean gsf_input_seek_emulate  (GsfInput *input, gsf_off_t pos);
 
-struct stat;
 gboolean gsf_input_set_modtime_from_stat (GsfInput *input,
                                          const struct stat *st);
 
diff --git a/gsf/gsf-input.c b/gsf/gsf-input.c
index aabf8a5..752268b 100644
--- a/gsf/gsf-input.c
+++ b/gsf/gsf-input.c
@@ -25,7 +25,6 @@
 #include <glib/gi18n-lib.h>
 
 #include <string.h>
-#include <sys/stat.h>
 
 
 /*