Let -DINTERRUPTIBLE=0 mask interrupts in probes

Some time ago we loosened up the code for all probe types to allow
interrupts during the handler.  However, when probing something like
kernel.trace("*"), you get a mix of probes in and out of the interrupt
path, and it becomes much more common to have probes skipped due to
interrupt reentrancy.

The common_probe_entryfn_prologue and common_probe_entryfn_epilogue
functions had an interruptible flag, but this was no longer used
anywhere.  I removed this flag, but then reused the logic to check an
INTERRUPTIBLE macro instead.  Now users can use -DINTERRUPTIBLE=0 to
prevent interrupt reentrancy in their script, at the cost of a bit more
overhead to toggle the interrupt mask.

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