Use WaitLatch() instead of pg_usleep() at the end of backups

This concerns pg_stop_backup() and BASE_BACKUP, when waiting for the
WAL segments required for a backup to be archived.  This simplifies a
bit the handling of the wait event used in this code path.

Author: Bharath Rupireddy
Reviewed-by: Michael Paquier, Stephen Frost
Discussion: 
https://postgr.es/m/calj2acu4adpcq6nlfca-zgwx7ppck5fgej-cau0xckzkass...@mail.gmail.com

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/2aca19f2989aa938ece7306678f5494a984ece3f

Modified Files
--------------
src/backend/access/transam/xlog.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

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