Remove warning about Gnu make version

[Nuru]

what

• Remove warning about Gnu make version added in Warning for make version #360

why

• The warning was unnecessary, misleading, and overly specific
  • The warning checked for "GNU Make 4.4". This of course will break when version 4.5 comes out. Furthermore, Ubuntu 20.4 LTS currently has GNU Make 4.2, which also triggers the warnings
  • The issues with building on macOS that were purported to be fixed by using GNU Make have not been clearly connected to the make version. I strongly suspect any issues with builds on Mac to be related to such things as macOS shipping with the ancient bash version 3.2.57, which is missing important features available in the current bash v5, or other aspects of macOS deviations from POSIX. These should be addressed by fixing the broken build recipes, not by requiring action on the part of the user (unless action is required, like installing jq, in which case this should cause an explicit and specific error message to be generated.