GNUmakefile: Be clear with GNU Make

In case someone runs GNU Make in this dir, eg. me or this guy CJefferson here: https://news.ycombinator.com/item?id=11773806
NetBSD · May 8, 2022 · 47a307d · 47a307d
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+all:
+	@echo "See README.md#bootstrapping"; echo; exit 1