Ensure write failure reports no-disk-space

A few places calling fwrite and gzwrite were not setting errno to ENOSPC
when reporting errors, as is customary; this led to some failures being
reported as
"could not write file: Success"
which makes us look silly.  Make a few of these places in pg_dump and
pg_basebackup use our customary pattern.

Backpatch-to: 9.5
Author: Justin Pryzby <[email protected]>
Author: Tom Lane <[email protected]>
Author: Álvaro Herrera <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/e74559c9763049ff4d3edd26817bad58c13113a1

Modified Files
--------------
src/bin/pg_basebackup/pg_basebackup.c | 16 ++++++++++++++++
src/bin/pg_dump/pg_backup_directory.c | 18 ++++++++++++++++++
2 files changed, 34 insertions(+)

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