[project @ 2003-06-16 15:31:13 by simonpj]

[project @ 2003-06-16 15:31:13 by simonpj]
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	Fix the "no interface file" bug
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The problem was this.

* Module A imports module B

* ghc --make A

* Remove B.hs, B.hi, and edit A so that it doesn't import B

* ghc --make A

Then GHC would fail, saying it can't find an interface file for B.
Reason: when loading A.hi (loadOldIface) it makes a Name for the
usages it finds.  To make a Name for B things, it needs B's package;
but it can't find B.hi, so it bombs instead.

Solution: don't complain if loadOldIface fails; instead behave just like
if you can't find A.hi.

Fixes a long-standing infelicity.