NEED_VERSION needs to be extended for version 4.2

[m.hadfield]

In makefile at line 31 the NEED_VERSION variable is defined to admit versions from 3.80 through 4.1. Gnu make 4.2 has now been sighted in the wild and should be added.

[arango]

Good to know, thank you Mark!

[m.hadfield]

And now Cygwin has upgraded make to 4.2.1!

I can see why this check was introduced, and why the limitations of make require the permitted versions to be hard-coded, but the updates are getting a bit tedious so perhaps it's time to drop it.

How about have make print a message like the following on every invocation:

"The ROMS makefile requires Gnu make with a version number > 3.80"

[arango]

Yes, I changed to test to be instead:

ifneq (3.80,$(firstword $(sort $(MAKE_VERSION) 3.80)))
 $(error This makefile requires GNU make version 3.80 or higher. \
                Your current version is: $(MAKE_VERSION))
endif

Please update your code.