bugfix: linking splines on ubuntu

[KSkwarczynski]

Pull request description

This is problem

/usr/bin/ld: ../_deps/mach3-build/splines/libSplines.so: undefined reference to covarianceXsec::GetSplineParsNamesFromDetID[abi:cxx11](int)'
/usr/bin/ld: ../_deps/mach3-build/splines/libSplines.so: undefined reference to covarianceXsec::GetSplineInterpolationFromDetID(int)'
/usr/bin/ld: ../_deps/mach3-build/splines/libSplines.so: undefined reference to covarianceXsec::GetGlobalSystIndexFromDetID(int, SystType)'
/usr/bin/ld: ../_deps/mach3-build/splines/libSplines.so: undefined reference to covarianceXsec::GetNumParamsFromDetID(int, SystType)'
/usr/bin/ld: ../_deps/mach3-build/splines/libSplines.so: undefined reference to covarianceXsec::GetSplineModeVecFromDetID(int)'

Problem is Splines depend on Covariance, so had to change linking order. Porblem only appeared for ubuntu

Changes or fixes

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