compiler: handle non-locally-exiting top-level forms.

* stdlib/compiler.tl (compile-file-conditionally): When evaluation
of a compiled top-level form is not suppressed, there is a risk
that it can terminate non-locally, via throwing an exception or
performing a block return. The compilation of the file is then
aborted. We can do better: using an unwind-protect, we can catch
all non-local control transfers out of the form and just ignore
them. The motivation for this is that it lets us compile files
which call (return-from load ...), without requiring that it be
written as (compile-only (return-from load ...)). Other things will
work, like compiling a (load "foo") where foo doesn't exist or
aborts due to errors.

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