[PATCH 1/5] Revert default system root back to ""

[Eli Zaretskii]

> From: Gary Benson <gbenson@redhat.com>
> Cc: Pedro Alves <palves@redhat.com>,        Sandra Loosemore <sandra@codesourcery.com>, Paul_Koning@Dell.com,        Jan Kratochvil <jan.kratochvil@redhat.com>,        Joel Brobecker <brobecker@adacore.com>
> Date: Tue, 28 Jul 2015 16:36:08 +0100
> 
> This commit reverts the default system root from "target:" to "".
> 
> gdb/ChangeLog:
> 
> 	* main.c (captured_main): Revert default sysroot back to "".
> 	* NEWS: Remove comment about default sysroot being "target:".

OK for NEWS.