Makefile: Centralize sw_vers executions and use globals for version check.
Makefile: Centralize sw_vers executions and use globals for version check.

maximermilov/cauliflowervest,google/cauliflowervest,google/cauliflowervest,maximermilov/cauliflowervest,maximermilov/cauliflowervest,google/cauliflowervest