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Fix signed / unsigned comparison warning from meta_enum.h

Christopher Rob Jones requested to merge jonrob/LHCb:fix-meta-enum-type-comp-warning into master

Fixes a minor warning exposed by d0 builds

Kernel/LHCbKernel/Kernel/meta_enum.h:204:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::array<meta_enum_internal::MetaEnumMember<MyEnum2>, 5>::size_type' {aka 'long unsigned int'} [-Wsign-compare]

not seen in other builds as (presumably) code is constexpr optimised away, and the compiler does not complain in this case.

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