[binutils-gdb] Remove forward declaration of struct stat

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT 7f3647e2ba4517be59ce531ec2297918b998fe3e ***

Author: Gary Benson <gbenson@redhat.com>
Branch: master
Commit: 7f3647e2ba4517be59ce531ec2297918b998fe3e

Remove forward declaration of struct stat
Forward declarations of struct stat break the Windows build.
This commit removes a forward declaration of struct stat and
includes sys/stat.h directly instead.

gdb/ChangeLog:

	PR gdb/18131
	* common/common-remote-fileio.h (sys/stat.h): New include.
	(stuct stat): Remove forward declaration.