Add MSVC build system support for ICU

Author: Ashutosh Sharma <ashu.coek88@gmail.com>
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>

src/tools/msvc/Solution.pm

@@ -220,6 +220,10 @@ s{PG_VERSION_STR "[^"]+"}{PG_VERSION_STR "PostgreSQL $self->{strver}$extraver, c
 		{
 			print $o "#define ENABLE_GSS 1\n";
 		}
+		if ($self->{options}->{icu})
+		{
+			print $o "#define USE_ICU 1\n";
+		}
 		if (my $port = $self->{options}->{"--with-pgport"})
 		{
 			print $o "#undef DEF_PGPORT\n";
@@ -555,6 +559,13 @@ sub AddProject
 		$proj->AddIncludeDir($self->{options}->{iconv} . '\include');
 		$proj->AddLibrary($self->{options}->{iconv} . '\lib\iconv.lib');
 	}
+	if ($self->{options}->{icu})
+	{
+		$proj->AddIncludeDir($self->{options}->{icu} . '\include');
+		$proj->AddLibrary($self->{options}->{icu} . '\lib\icuin.lib');
+		$proj->AddLibrary($self->{options}->{icu} . '\lib\icuuc.lib');
+		$proj->AddLibrary($self->{options}->{icu} . '\lib\icudt.lib');
+	}
 	if ($self->{options}->{xml})
 	{
 		$proj->AddIncludeDir($self->{options}->{xml} . '\include');
@@ -677,6 +688,7 @@ sub GetFakeConfigure
 	$cfg .= ' --with-libxml'        if ($self->{options}->{xml});
 	$cfg .= ' --with-libxslt'       if ($self->{options}->{xslt});
 	$cfg .= ' --with-gssapi'        if ($self->{options}->{gss});
+	$cfg .= ' --with-icu'           if ($self->{options}->{icu});
 	$cfg .= ' --with-tcl'           if ($self->{options}->{tcl});
 	$cfg .= ' --with-perl'          if ($self->{options}->{perl});
 	$cfg .= ' --with-python'        if ($self->{options}->{python});

src/tools/msvc/config_default.pl

@@ -15,6 +15,7 @@ our $config = {
 	ldap      => 1,        # --with-ldap
 	extraver  => undef,    # --with-extra-version=<string>
 	gss       => undef,    # --with-gssapi=<path>
+	icu       => undef,    # --with-icu=<path>
 	nls       => undef,    # --enable-nls=<path>
 	tap_tests => undef,    # --enable-tap-tests
 	tcl       => undef,    # --with-tls=<path>