Compilation issue with merge stats with INTEL in macOS

[loganoz]

---

| Linking bin/horses.mergeStats |

ifort -cpp -O0 -g -warn all -fpscomp logicals -traceback -check bounds -check uninit -ftrapuv -debug all -ftrace=full -ftz -fp-model precise -fp-speculation=off -assume bscc -D_has_Quad -mkl -fopenmp -o ./bin/horses.mergeStats ./build/getTaskModule.o ./build/StatsAveragingModule.o ./build/main.o -L/Users/grubio/Codes/GitHub/horses3d/Solver/lib -ltimeintegrator_ns -ljacobian_ns -ldiscretization_ns -lmonitors_ns -lparticles_ns -lmesh_ns -lphysics_ns -lphysicsns -lio -lspectral -lmpiutils -lfoundation -lftobject -lsources_ns -lml /Users/grubio/Codes/GitHub/horses3d/Solver/lib/libproblemfile_ns.dylib -Wl,-rpath,./SETUP,-rpath,/Users/grubio/Codes/GitHub/horses3d/Solver/lib
ifort: command line remark #10412: option '-mkl' is deprecated and will be removed in a future release. Please use the replacement option '-qmkl'
Undefined symbols for architecture x86_64:
"statisticsmonitor_mp_no_of_variables", referenced from:
statsaveragingmodule_mp_initialize_statsaveragingmodule in StatsAveragingModule.o
statsaveragingmodule_mp_mesh_construct in StatsAveragingModule.o
ld: symbol(s) not found for architecture x86_64
make[1]: *** [bin/horses.mergeStats] Error 1
make: *** [addons] Error 1