fix installed fixincludes

[Paolo Bonzini]

> I suspect this of causing the build failure
> 
> make[1]: Entering directory `/home/jsm28/src/gcc-build/fixincludes'
> make[1]: *** No rule to make target `dvi'.  Stop.
> make[1]: Leaving directory `/home/jsm28/src/gcc-build/fixincludes'
> make: *** [dvi-fixincludes] Error 1
> 
> from make dvi.

Fixed with the attached obvious patch, committed to gcc and (the 
toplevel part) to src.

Paolo
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