COMP: resolve signed/unsigned long ambiguity on Darwin

applications/test/limits/Test-limits.C

applications/test/machine-sizes/Make/files

applications/test/machine-sizes/Make/options

applications/test/machine-sizes/Test-machine-sizes.cpp

src/OpenFOAM/primitives/Scalar/Scalar.H

src/OpenFOAM/primitives/bools/bool/bool.H

src/OpenFOAM/primitives/ints/int32/int32.H

src/OpenFOAM/primitives/ints/int64/int64.H

src/OpenFOAM/primitives/ints/int64/int64IO.C

src/OpenFOAM/primitives/ints/uint32/uint32.H

src/OpenFOAM/primitives/ints/uint64/uint64.H

src/OpenFOAM/primitives/ints/uint64/uint64IO.C