remove most redundant includes of sys/stat.h; it's included in nano.h,

so it doesn't need to be included in files that include nano.h


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2053 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/files.c

@@ -26,7 +26,6 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <sys/wait.h>
-#include <sys/stat.h>
 #include <utime.h>
 #include <fcntl.h>
 #include <errno.h>