[m-rev.] for review: fix `mmc --make' installation bug

[Simon Taylor]

On 13-Nov-2002, Simon Taylor <stayl at cs.mu.OZ.AU> wrote:
> 
> Estimated hours taken: 3
> Branches: main, release
> 
> compiler/options_file.m:
> 	Fix a bug which caused `mmc --make libfoo.install' to only
> 	install the default grade. The problem was that the code
> 	was treating an unset LIBGRADES variables as if it
> 	were set using `LIBGRADES=', overwriting the default
> 	setting of the library grades.

Committed.

Simon.
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