unwind: regression: signal mask restoring.

We have a regression introduced in TXR 230, as part of the
bugfix for the extended_setjmp crash caused by PIE
executables.

This bug (for instance) causes signal handling to misbehave
after TXR handles a single asynchronous signal. In the REPL,
if the user interrupts a (usleep ...) operation with Ctrl-C,
it is afterward not possible to issue any more Ctrl-C
interrupts, asynchronous or not. The reason is that an
asynchronous interrupt directly throws an exception out of
the signal handler. Then the botched restoring of the signal
mask in extjmp_restore will install the wrong signal mask,
causing the signal to be blocked.

* unwind.c (extjmp_restore): Remove stray statement that
clobbers the saved mask of blocked signals. This was
accidentally been copy-and-pasted from extjmp_save.

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