Fix -mrecip errors in clang.

Notice that currently "#" comment is parsed correctly by scram for some reason so the flags in KalmanUpdators actually are in the build.
comments in the first line did not work.

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> On 01/set/2014, at 23:45, Slava Krutelyov <notifications@github.com> wrote:
> 
> In TrackingTools/KalmanUpdators/BuildFile.xml:
> 
> > @@ -1,4 +1,8 @@
> > -#<flags   CXXFLAGS="-Ofast -mrecip -funroll-all-loops"/>
> > +<flags   CXXFLAGS="-Ofast -funroll-all-loops"/>
> What was the issue with the comments?
> based on verbose printouts from scram, I see that 
> #<flags CXXFLAGS="-Ofast -mrecip -funroll-all-loops"/> 
> was actually treated as uncommented
> 
> —
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