GNUmakefile: Be clear on Linux

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 6, 2022 · 1df3aa2 · 1df3aa2
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+all:
+	@echo "Use bootstrap/bootstrap to install bmake (BSD make), then run it instead."