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Fix the recurisve make targets by using $(MAKE).  Otherwise we get lots of
warnings and issues with parallel builds.

Fix the install target -- the man subdir was missing a dummy target.

Add proper .PHONY markings.

Change-Id: I640d42af0bdf96baf6ff0ca022fd3f7f444b2d05
Signed-off-by: Mike Frysinger <vapier@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/179621

Reviewed-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: Chris Ball <chris@printf.net>

This commit was made by Chris Ball, but reuses framework code from
Goffredo's btrfs-progs/btrfs.c.
Signed-off-by: Chris Ball <cjb@laptop.org>