bug#68272: [PATCH] Fix -1 leaking from C to lisp in 'read-event' etc.

[Tim Ruffing]

Hi, this is an updated patch set.

Changes to the previous revision:
 * Instead of changing requeued_events_pending_p, it's renamed to
   requeued_command_events_pending_p, and I've fixed the outdated
   comment that had misled me.  Then a new requeued_events_pending_p
   with different semantics is added and used in following commits.
   This addresses one of Eli's comments, and should make sure that
   existing callers of requeued_events_pending_p are not affected by
   the patch.
 * I've added a large comment to src/macro.c as an attempt to explain
   how we handle the end of a keyboard macro.
 * I've improved the commit message of (now) 6be0f5f. 

Best,
Tim

0001-Extract-check-for-end-of-macro-to-function.patch
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0002-src-keyboard.c-requeued_events_pending_p-Improve-nam.patch
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0003-src-keyboard.c-requeued_events_pending_p-New-functio.patch
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0004-Continue-reading-in-read-event-etc.-at-the-end-of-a-.patch
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0005-Remove-workarounds-for-solved-read-event-bug.patch
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