[patch 2.21/trunk] fix binutils install target for multi powerpc target configuration

[Matthias Klose]

The fix for PR ld/12820 did break the installation when configured with 
--enable-targets=powerpc-linux-gnu,powerpc64-linux-gnu,...

/usr/bin/install -c embedspu embedspu 
'/home/packages/binutils/binutils-2.21.0.20110530/debian/binutils-multiarch/usr/bin'
/usr/bin/install: will not overwrite just-created 
`/home/packages/binutils/binutils-2.21.0.20110530/debian/binutils-multiarch/usr/bin/embedspu' 
with `embedspu'
make[6]: *** [install-binSCRIPTS] Error 1

patch attached.

   Matthias
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