ARM libffi asm syntax patch

[Joel Sherrill]

Hi,

In compiling gcc go to target arm-rtems4.10,
we got a syntax error on src/arm/sysv.S.  arm-rtems
is ELF based not EABI based.  Ian suggested
adding UNWIND and this let the compile proceed.

Is this OK to commit?

2010-04-09  Joel Sherrill <joel.sherrill@oarcorp.com>

     * src/arm/ffi.S: Add UNWIND.


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Joel Sherrill, Ph.D.             Director of Research&  Development
joel.sherrill@OARcorp.com        On-Line Applications Research
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