Adjust new TAP test to work on macOS.

Seems Apple's version of "wc -l" puts spaces before the number.
(I wonder why the cfbot didn't find this.)  While here, make
the failure case log what it got, to aid debugging future issues.

Per buildfarm.

src/bin/psql/t/030_pager.pl

@@ -25,8 +25,10 @@ my $result = IPC::Run::run [ 'wc', '-l' ],
   '>' => \$wcstdout,
   '2>' => \$wcstderr;
 chomp $wcstdout;
-if ($wcstdout ne '2' || $wcstderr ne '')
+if ($wcstdout !~ /^ *2$/ || $wcstderr ne '')
 {
+	note "wc stdout = '$wcstdout'\n";
+	note "wc stderr = '$wcstderr'\n";
 	plan skip_all => '"wc -l" is needed to run this test';
 }
 
@@ -83,17 +85,17 @@ do_command(
 
 do_command(
 	"SELECT 'test' AS t FROM generate_series(1,24);\n",
-	qr/^24\r?$/m,
+	qr/^ *24\r?$/m,
 	"execute SELECT query that needs pagination");
 
 do_command(
 	"\\pset expanded\nSELECT generate_series(1,20) as g;\n",
-	qr/^39\r?$/m,
+	qr/^ *39\r?$/m,
 	"execute SELECT query that needs pagination in expanded mode");
 
 do_command(
 	"\\pset tuples_only off\n\\d+ information_schema.referential_constraints\n",
-	qr/^\d+\r?$/m,
+	qr/^ *\d+\r?$/m,
 	"execute command with footer that needs pagination");
 
 # send psql an explicit \q to shut it down, else pty won't close properly