Enable settings used in TAP tests for MSVC builds

Certain settings from configuration or the Makefile infrastructure are
used by the TAP tests, but were not being set up by vcregress.pl. This
remedies those omissions. This should increase test coverage, especially
on the buildfarm.

Reviewed by Noah Misch

Discussion: https://postgr.es/m/17093da5-e40d-8335-d53a-2bd803fc38b0@dunslane.net

Backpatch to all live branches.

Author: adunstan

src/tools/msvc/vcregress.pl

@@ -59,6 +59,21 @@
 copy("$Config/regress/regress.dll",               "src/test/regress");
 copy("$Config/dummy_seclabel/dummy_seclabel.dll", "src/test/regress");
 
+# Configuration settings used by TAP tests
+$ENV{with_ssl} = $config->{openssl} ? 'openssl' : 'no';
+$ENV{with_ldap} = $config->{ldap} ? 'yes' : 'no';
+$ENV{with_icu} = $config->{icu} ? 'yes' : 'no';
+$ENV{with_gssapi} = $config->{gss} ? 'yes' : 'no';
+$ENV{with_krb_srvnam} = $config->{krb_srvnam} || 'postgres';
+$ENV{with_readline} = 'no';
+
+# These values are defaults that can be overridden by the calling environment
+# (see buildenv.pl processing above).
+# c.f. src/Makefile.global.in and configure.ac
+$ENV{TAR} ||= 'tar';
+$ENV{LZ4} ||= 'lz4';
+$ENV{GZIP_PROGRAM} ||= 'gzip';
+
 $ENV{PATH} = "$topdir/$Config/libpq;$ENV{PATH}";
 
 if ($ENV{PERL5LIB})