Fix missing /local in make-boot.r

Due to the missed /local, the global `data` is overwritten. Currently,
this only results in a weird informational message (compressed code
beeing much larger than the supposedly uncompressed code).

But it also result in the uncompressed original code becoming
unavailable after compression. This is a nuisance, if we want to emit
uncompressed code for whatever reason.
Merge pull request #57 from earl/misc-fixes

Fix missing /local in make-boot.r