[PATCH] [RSB] use updated newlib revision for or1k

[Stefan Wallentowitz]

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Hi Hesham,

there is also a GCC-6 snapshot available:
https://github.com/openrisc/newlib/releases/tag/gcc6-preview

This was the GCC version used in the other architectures last week, so
maybe it makes sense to bump to this GCC version, too.

Best,
Stefan
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