Warnings when building for arm

[Tito]

Hi,
while building for arm I've noticed this warnings:

libbb/sha1.c:176:1: warning: "R0" redefined
In file included from /home/tito/Desktop/android/arm-2008q3/bin/../arm-none-linux-gnueabi/libc/usr/include/signal.h:353,
                 from include/libbb.h:22,
                 from libbb/sha1.c:31:
/home/tito/Desktop/android/arm-2008q3/bin/../arm-none-linux-gnueabi/libc/usr/include/sys/ucontext.h:44:1: warning: this is the location of the previous definition
libbb/sha1.c:177:1: warning: "R1" redefined
/home/tito/Desktop/android/arm-2008q3/bin/../arm-none-linux-gnueabi/libc/usr/include/sys/ucontext.h:46:1: warning: this is the location of the previous definition


The build completes, so it is not a big problem.
Attached is a trivial patch that seems to fix the problem.
Hope I've got it right with this obscure git voodo. 

Ciao,
Tito
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