Support building with Visual Studio 2017

Haribabu Kommi, reviewed by Takeshi Ideriha and Christian Ullrich

Backpatch to 9.6

src/tools/msvc/MSBuildProject.pm

@@ -483,4 +483,27 @@ sub new
 	return $self;
 }
 
+package VC2017Project;
+
+#
+# Package that encapsulates a Visual C++ 2017 project file
+#
+
+use strict;
+use warnings;
+use base qw(VC2012Project);
+
+sub new
+{
+	my $classname = shift;
+	my $self      = $classname->SUPER::_new(@_);
+	bless($self, $classname);
+
+	$self->{vcver}           = '15.00';
+	$self->{PlatformToolset} = 'v141';
+	$self->{ToolsVersion}    = '15.0';
+
+	return $self;
+}
+
 1;