mk: evaluate variables with $(shell)

Now that we use GNU make, instead of deferred evaluation when running
the target commands, use $(shell) to evaluate commands when parsing the
makefile and print prettier build commands.

Before:

go build -trimpath `contrib/goflags.sh` -ldflags \
	"-X main.Version=`git describe --long --abbrev=12 --tags --dirty 2>/dev/null || echo 0.15.2` \
	-X main.Flags=$(echo -- `contrib/goflags.sh` | base64 | tr -d '\r\n') \
	-X git.sr.ht/~rjarry/aerc/config.shareDir=/usr/local/share/aerc \
	-X git.sr.ht/~rjarry/aerc/config.libexecDir=/usr/local/libexec/aerc" \
	-o aerc

After:

go build -trimpath -tags=notmuch -ldflags \
	"-X main.Version=0.15.2-174-gf25e038dacd7-dirty \
	-X main.Flags=LS0gLXRhZ3M9bm90bXVjaAo= \
	-X git.sr.ht/~rjarry/aerc/config.shareDir=/usr/local/share/aerc \
	-X git.sr.ht/~rjarry/aerc/config.libexecDir=/usr/local/libexec/aerc" \
	-o aerc

Signed-off-by: Robin Jarry <robin@jarry.cc>
Acked-by: Moritz Poldrack <moritz@poldrack.dev>

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