Fix the MS-Windows MinGW build

* build_w32.bat (GccCompile): Use -std=gnu99, as some code uses
C99 features ('for' loop initial declarations).

* dir.c (print_dir_data_base) [WINDOWS32]: Cast 'mtime' to
'int64_t', and use %I64d to print it, to avoid compile-time
warning about printing a 'time_t' value, which could be either
a 32-bit or a 64 bit integral type.
diff --git a/build_w32.bat b/build_w32.bat
index bef80f9..9d75258 100755
--- a/build_w32.bat
+++ b/build_w32.bat
@@ -157,7 +157,7 @@
 :GccCompile

 :: GCC Compile

 echo on

-gcc -mthreads -Wall -gdwarf-2 -g3 %OPTS% -I%OUTDIR% -I. -I./glob -I./w32/include -DWINDOWS32 -DHAVE_CONFIG_H %EXTRAS% -o %OUTDIR%\%1.o -c %1.c

+gcc -mthreads -Wall -std=gnu99 -gdwarf-2 -g3 %OPTS% -I%OUTDIR% -I. -I./glob -I./w32/include -DWINDOWS32 -DHAVE_CONFIG_H %EXTRAS% -o %OUTDIR%\%1.o -c %1.c

 @echo off

 goto :EOF

 

diff --git a/dir.c b/dir.c
index de85a3c..203a146 100644
--- a/dir.c
+++ b/dir.c
@@ -1082,8 +1082,9 @@
           else if (dir->contents->dirfiles.ht_vec == 0)
             {
 #ifdef WINDOWS32
-              printf (_("# %s (key %s, mtime %d): could not be opened.\n"),
-                      dir->name, dir->contents->path_key,dir->contents->mtime);
+              printf (_("# %s (key %s, mtime %I64d): could not be opened.\n"),
+                      dir->name, dir->contents->path_key,
+		      (int64_t)dir->contents->mtime);
 #else  /* WINDOWS32 */
 #ifdef VMS_INO_T
               printf (_("# %s (device %d, inode [%d,%d,%d]): could not be opened.\n"),
@@ -1118,8 +1119,9 @@
                     }
                 }
 #ifdef WINDOWS32
-              printf (_("# %s (key %s, mtime %d): "),
-                      dir->name, dir->contents->path_key, dir->contents->mtime);
+              printf (_("# %s (key %s, mtime %I64d): "),
+                      dir->name, dir->contents->path_key,
+		      (int64_t)dir->contents->mtime);
 #else  /* WINDOWS32 */
 #ifdef VMS_INO_T
               printf (_("# %s (device %d, inode [%d,%d,%d]): "),