- add version info for v1.8.0
- v1.8.0 adds a new source file, `file.c`, which need to be included
in our hardcoded list of objects to link.
I discovered this while demonstrating "how easy it is to add a new
package to Spack", only to scratch my head when it failed `spack
install` but worked when I ran `make` in the stage dir. Finally
looked at tree/package.py and it All Became Clear.
Perhaps someone should rewrite this to use MakefilePackage, but the
Makefile starts off with a bunch of twisty turny "uncomment these
lines to run on this platform", so it might not be worth it.
53f4db938f