[PATCH] Register --sysroot in the driver switches table

[Olivier Hainque]

> On 5 Jan 2022, at 10:26, Olivier Hainque <hainque@adacore.com> wrote:
> 
> The change should also set "validated" true 
> when requesting to save --sysroot.

The attached adjustment fixes the failure I could reproduce,
bootstraps and regtests fine on x86_64-linux, and passes a build
+ a couple of in-house testsuites for one of our vxworks ports.

Ok to commit?

Thanks in advance,

Olivier

2022-01-05  Olivier Hainque  <hainque@adacore.com>

	* gcc.c (driver_handle_option): State --sysroot as
	validated.

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