Address 'overlength string' warning in LoKiPhys dictionary generation
As discussed in !628 (merged), the LoKiPhys dictionary generation generates warnings when built under clang.
build/Phys/LoKiPhys/LoKiPhysDict.cpp:26369:38: warning: string literal of length 95823 exceeds maximum length 65536 that C++ compilers are required to support [-Woverlength-strings]
This warning is now disable for this compilation unit in !628 (merged), but ideally the source of the big-string generation would be fixed.
/cc @ibelyaev