Sparse 0.3 version number

So, the 0.3 release went out...with VERSION=0.2 in the Makefile. Oops.

Fortunately, $(VERSION) currently only affects the version number in the pkg-config file sparse.pc. If you have written some software that depends on Sparse, uses pkg-config to check for it with a sufficient version number, and hoped to depend on 0.3 or newer, my apologies. Fortunately, I suspect few to no people have done this.

I plan to put out a release shortly with a fix for this, as well as a couple of additional opportunistic fixes. I also plan to include a "make dist" with some checks to prevent this from happening again.

- Josh Triplett