Use git version to get version name

Using git version is simpler as it handles oddball cases internally.
Since we have been using mostly lightweight tags I have set it to
search those in addition to annotated tags for the best match. The
output for commits that don't have a tag seems a bit nicer as well.

Makefile

@@ -1,9 +1,5 @@
-# Get the version name first by seeing if HEAD is tagged
-version := $(shell git tag --points-at HEAD -l '0.*.*' | sort -r | head -1)
-# And if it wasn't use a git hash
-ifeq ($(version),)
-  version := $(shell git log -1 --abbrev=8 --pretty=git%h)
-endif
+# Get a version name based off the nearest tag (include lightweight tags)
+version := $(shell git describe --tags)
 
 DESTDIR := /usr