Back-patch fixes to make TAP tests work on Windows.

This back-ports commit 13d856e177e69083 and assorted followon patches
into 9.4 and 9.5.  9.5 and HEAD are now substantially identical in all
the files touched by this commit, except that 010_pg_basebackup.pl has
a few more tests related to the new --slot option.  9.4 has many fewer
TAP tests, but the test infrastructure files are substantially the same,
with the exception that 9.4 lacks the single-tmp-install infrastructure
introduced in 9.5 (commit dcae5faccab64776).

The primary motivation for this patch is to ensure that TAP test case
fixes can be back-patched without hazards of the kind seen in commits
34557f544/06dd4b44f.  In principle it should also make the world safe
for running the TAP tests in the buildfarm in these branches; although
we might want to think about back-porting dcae5faccab64776 to 9.4 if
we're going to do that for real, because the TAP tests are quite disk
space hungry without it.

Michael Paquier did the back-porting work; original patches were by
him and assorted other people.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/test/perl/SimpleTee.pm b/src/test/perl/SimpleTee.pm
index 8d31a4013c8..5da82d0f85d 100644
--- a/src/test/perl/SimpleTee.pm
+++ b/src/test/perl/SimpleTee.pm
@@ -20,6 +20,7 @@ sub PRINT {
 	my $ok = 1;
 	for my $fh (@$self) {
 		print $fh @_ or $ok = 0;
+		$fh->flush or $ok = 0;
 	}
 	return $ok;
 }