Makefile.mk: fixup enabling libidn2 #14421
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Replicate the method used by autotools and cmake to enable libidn2.
This way
lib/curl_setup.h
setsUSE_LIBIDN2
automatically.Before this patch,
USE_LIBIDN2
was enabled directly, shortcuttinginternal logic prioritizing IDN backends.
(This is academic now because
Makefile.mk
no longer supportsother IDN backends. But still useful for clarity.)
Closes #14421