[PATCH][libstdc++-v3 parallel mode] Do not declare a mutable reference

[Johannes Singler]

Mainline was failing to compile the parallel mode multiway merge 
facilities because of a spurious mutable reference.

Test on x86_64-unknown-linux-gnu: no regressions.

Pre-approved by Jonathan Wakely, committed.

2011-01-24  Johannes Singler  <singler@kit.edu>

         PR libstdc++/47437
         * include/parallel/multiway_merge.h (_UnguardedIterator):
         Remove useless "mutable" from reference declaration.

Johannes
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