[PATCH] Added support for AC_ARG_WITH([grep]...) and sed substitution fixes

[Yann E. MORIN]

Fabian, All,

On 2014-08-06 04:27 +0200, Fabian Freyer spake thusly:
> While it is possible to tell crosstool-NG to use custom GNU tools for several
> tools, it is not possible for all tools, especially for grep and sed. This 
> causes ct-ng build to fail:
[--SNIP--]

Also, you forgot to sign-off-by your patch, with something like:
    Signed-off-by: Your NAME <you@somewheere.net>

Regards,
Yann E. MORIN.

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