[patch] Avoid defining assert in reent.h

[Paul Brook]

On _REENT_SMALL targets reent.h pollutes the user namespace by defining 
assert(x). This causes a failure in the libstdc++ testsuite 
(17_intro/no_assert_neg.cc).

The attached patch fixes this by defining and using __reent_assert.

Tested with cross to arm-none-eabi.
Ok?

Paul

2006-09-20  Paul Brook  <paul@codesourcery.com>

	newlib/
	* libc/include/sys/reent.h: Define and use __reent_assert.
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