[PATCH, ARM] Don't use __thumb2__ to select _REENT_SMALL

[Richard Earnshaw]

This cost me at least a couple of hours debugging at the weekend; I was
trying to work out why my file handles were all corrupted when compiling
code for Thumb-2.  It turns out that Newlib's config.h was changing the
ABI depending on the instruction set it was compiling for -- a big No
No, since code is supposed to interwork freely between the two ISAs!

Anyway, I think the following (added by Paul back in 2006) is just
wrong.  We need a more precise way to detect M-profile devices if they
must have smaller newlib footprints.

I've chosen to comment out this code rather than remove it, since that
way it acts as a clear reminder as to why we don't want to do this.  If
someone adds more precise targeting of M-profile cores, then the code
here can then go entirely.

R.

2009-06-02  Richard Earnshaw  <rearnsha@arm.com>

	* include/sys/config.h ([__thumb2__]): Don't define _REENT_SMALL.
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